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  • Platalea minor (bird)

    spoonbill: alba); the lesser spoonbill (P. minor) of eastern Asia; and two Australian species, the royal, or black-billed, spoonbill (P. regia), and the yellow-billed, or yellow-legged, spoonbill (P. flavipes).

  • Platalea regia (bird)

    spoonbill: …and two Australian species, the royal, or black-billed, spoonbill (P. regia), and the yellow-billed, or yellow-legged, spoonbill (P. flavipes).

  • Plataleinae (bird)

    Spoonbill, any member of six species of long-legged wading birds that constitute the subfamily Plataleinae of the family Threskiornithidae (order Ciconiiformes), which also includes the ibises. Spoonbills are found in estuaries, saltwater bayous, and lakes. They feed by sweeping the long bill from

  • Platanaceae (plant family)

    Proteales: Platanaceae has a single Northern Hemisphere genus Platanus, with 8–10 species. Similarly, Nelumbonaceae has just one aquatic genus, Nelumbo (lotus), with two north-temperate species. The reassignment of these families into a single order was a surprising consequence of family-level molecular studies. It is hard to…

  • Platanista (genus of mammals)

    cetacean: Sight: …genus of river dolphin (Platanista of the muddy Ganges and Indus rivers), the eyes are reduced to organs that can detect only the difference between light and dark. The external opening for the eye is a slit only 2–3 cm (about an inch) long.

  • Platanista gangetica (mammal)

    dolphin: Conservation status: …the Ganges river dolphin (Platanista gangetica) and the Indus river dolphin (P. minor), which are classified as endangered species, and the Atlantic humpbacked dolphin (Sousa teuszii), which is classified as critically endangered.

  • Platanista minor (mammal)

    Pakistan: Plant and animal life: …itself is home to the Indus river dolphin, a freshwater dolphin whose habitat has been severely stressed by hunting, pollution, and the creation of dams and barrages. At least two types of sea turtles, the green and olive ridley, nest on the Makran coast.

  • Platanistidae (mammal family)

    dolphin: Paleontology and classification: Family Platanistidae (river dolphins) 2 species in 1 genus inhabiting rivers and coasts of the Indus, Ganges, Brahmaputra, and Meghna rivers. Family Iniidae (South American river dolphins) 5 species in 3 genera inhabiting rivers and coasts of eastern South America and China. The

  • platanna (amphibian)

    clawed frog: …the African clawed frog, or platanna (X. laevis) of southern Africa, a smooth-skinned frog about 13 cm (5 inches) long. It is valuable for mosquito control, because it eats the eggs and young of those insects. Native to sub-Saharan Africa, X. laevis was introduced to the United States and Britain.…

  • Platanthera (plant, genus Platanthera)

    Rein orchid, (genus Platanthera), genus of about 100 species of terrestrial orchids (family Orchidaceae) found throughout much of the Northern Hemisphere. Rein orchids grow in grasslands, bogs, forests, and sand dunes in subtropical and warm temperate areas. Rein orchids are perennial plants and

  • Platanus

    Plane tree, any of the 10 species of the genus Platanus, the only genus of the family Platanaceae. These large trees are native in North America, eastern Europe, and Asia and are characterized by scaling bark; large, deciduous, usually palmately lobed leaves; and globose heads of flower and seed.

  • Platanus acerifolia (plant)

    plane tree: The London plane (P. acerifolia), a hybrid between the American and the Oriental planes, combines characteristics of both in varying degrees. It is a little shorter and more squat than the American tree and usually has bristly, paired seedballs. There are variegated forms of London plane.…

  • Platanus occidentalis (plant)

    plane tree: The American plane tree, or sycamore (P. occidentalis), also known as buttonwood, buttonball, or whitewood, is the tallest, sometimes reaching a height of more than 50 m (160 feet). Its pendent, smooth, ball-shaped seed clusters usually dangle singly and often persist after leaf fall. Native from…

  • Platanus orientalis (plant)

    plane tree: …southeastern Europe to India, the Oriental plane (P. orientalis) reaches 30 m (100 feet) with huge, often squat boles—some measuring nearly 10 m in circumference (about 10 feet in diameter). Its bristly seedballs hang in clusters of two to six. The London plane (P. acerifolia), a hybrid between the American…

  • Platanus racemosa (plant)

    plane tree: The California sycamore (P. racemosa), about 25 m (80 feet) tall, has contorted branches, thick leaves, and bristly seedballs in groups of two to seven.

  • Plataspidae (insect family)

    heteropteran: Annotated classification: Family Plataspidae Oval to transversely oval; head small, inserted deeply into prothorax; scutellum large, broadly U-shaped, reaching apex of abdomen; forewings much longer than body; wing membrane transversely folded at base and inserted under scutellum; tibiae not spined; phytophagous; about 500 species; found only in the…

  • plate (electronics)

    Anode, the terminal or electrode from which electrons leave a system. In a battery or other source of direct current the anode is the negative terminal, but in a passive load it is the positive terminal. For example, in an electron tube electrons from the cathode travel across the tube toward the

  • plate (printing)

    embossing: …means of engraved dies or plates. Crests, monograms, and addresses may be embossed on paper and envelopes from dies set either in small handscrew presses or in ordinary letterpresses. Blocked ornaments on book covers or imitation tooling on leatherwork can be effected by means of powerful embossing presses. For impressing…

  • plate (photography)

    history of photography: Heliography: …then placed it on a plate coated with a light-sensitive solution of bitumen of Judea (a type of asphalt) and lavender oil and exposed the setup to sunlight. After a few hours, the solution under the light areas of the engraving hardened, while that under the dark areas remained soft…

  • plate (meteorology)

    climate: Snow and sleet: …seven types of snow crystals: plates, stellars, columns, needles, spatial dendrites, capped columns, and irregular crystals. The size and shape of the snow crystals depend mainly on the temperature of their formation and on the amount of water vapour that is available for deposition. The two principal influences are

  • plate (geology)

    Earth: The outer shell: …major separate rigid blocks, or plates. There are two types of plates, oceanic and continental. An example of an oceanic plate is the Pacific Plate, which extends from the East Pacific Rise to the deep-sea trenches bordering the western part of the Pacific basin. A continental plate is exemplified by…

  • plate (metallurgy)

    mechanics of solids: Beams, columns, plates, and shells: The 1700s and early 1800s were a productive period during which the mechanics of simple elastic structural elements were developed—well before the beginnings in the 1820s of the general three-dimensional theory. The development of beam theory by Euler, who generally modeled beams…

  • plate armour (armour)

    armour: Premodern armour: Thus, plate armour of steel superseded mail during the 14th century, at first by local additions to knees, elbows, and shins, until eventually the complete covering of articulated plate was evolved. A complete suit of German armour from about 1510 shows a metal suit with flexible…

  • plate boundary (geology)

    plate tectonics: Plate boundaries: Lithospheric plates are much thicker than oceanic or continental crust. Their boundaries do not usually coincide with those between oceans and continents, and their behaviour is only partly influenced by whether they carry oceans, continents, or both. The Pacific Plate, for example, is…

  • plate freezer

    food preservation: Industrial freezers: Plate freezers are used to freeze flat products, such as pastries, fish fillets, and beef patties, as well as irregular-shaped vegetables that are packaged in brick-shaped containers, such as asparagus, cauliflower, spinach, and broccoli. The food is firmly pressed between metal plates that are cooled…

  • plate girder (architecture)

    bridge: Beam bridges: …in the form of plate girders. A plate girder is an I beam consisting of separate top and bottom flanges welded or bolted to a vertical web. While beams for short spans are usually of a constant depth, beams for longer spans are often haunched—that is, deeper at the supports…

  • plate glass

    Plate glass, form of glass originally made by casting and rolling and characterized by its excellent surface produced by grinding and polishing. Plate glass was first made in the 17th century in France, after which several improvements in the original batch technique culminated in the Bicheroux

  • plate glass insurance

    insurance: Miscellaneous insurance: The extensive use of plate glass in modern architecture has produced a special comprehensive insurance that covers not only plate glass but glass signs, motion-picture screens, halftone screens and lenses, glass bricks, glass doors, and so forth. It may be written to cover loss from any source except fire…

  • plate heat exchanger

    food preservation: Pasteurization: …liquid eggs are pasteurized using plate-type heat exchangers. Wine and fruit juices are normally deaerated prior to pasteurization in order to remove oxygen and minimize oxidative deterioration of the products. Plate-type heat exchangers consist of a large number of thin, vertical steel plates that are clamped together in a frame.…

  • plate height (chemistry)

    chromatography: Column efficiency: …theoretical plate (or plate height), HETP (or h), which is L/N, L being the length of the column. Efficient columns have small h values (see below Plate height).

  • plate mill (metallurgy)

    steel: Plates: Rolled from heavy slabs supplied by a slabbing mill or continuous caster or sometimes rolled directly from an ingot, plates vary greatly in dimensions. The largest mills can roll plates 200 millimetres thick, 5 metres wide, and 35 metres long. These three dimensions are…

  • plate motor ending (anatomy)

    human nervous system: Muscle spindles: The plate motor endings lie toward the ends of the intrafusal fibres. They are fairly similar to the motor end plates of the skeletal, or extrafusal, muscle fibres.

  • plate number, theoretical (chemistry)

    chromatography: Column efficiency: …column is reported as the number of theoretical plates (plate number), N, a concept Martin borrowed from his experience with fractional distillation:

  • plate tectonics (geology)

    Plate tectonics, theory dealing with the dynamics of Earth’s outer shell—the lithosphere—that revolutionized Earth sciences by providing a uniform context for understanding mountain-building processes, volcanoes, and earthquakes as well as the evolution of Earth’s surface and reconstructing its

  • plate tracery (architecture)

    tracery: In plate tracery, found in early French and English Gothic work, the tympanum is pierced with a single circular or four-lobed opening. Later, the number and complexity of the piercings was increased, adding size and beauty to the entire unit. The climax of plate tracery appears…

  • Plate, River (estuary, South America)

    Río de la Plata, (Spanish: “River of Silver”) a tapering intrusion of the Atlantic Ocean on the east coast of South America between Uruguay to the north and Argentina to the south. While some geographers regard it as a gulf or as a marginal sea of the Atlantic, and others consider it to be a river,

  • plate-jacking method (excavation)

    tunnels and underground excavations: Rock-mechanics investigation: …simplest field test is the plate-jacking method, in which the rock in a test drift is loaded by hydraulic jacks acting on a plate two to three feet in diameter. Larger areas can be tested either by radially loading the internal surface of a test tunnel or by pressurizing a…

  • platea (medieval theatre)

    Platea, in medieval theatre, the neutral acting area of a stage. In medieval staging, a number of mansions, or booths, representing specific locations, were placed around the acting area. The actors would move from mansion to mansion as the play demanded. The platea would assume the scenic

  • Plateau (astronomy)
  • Plateau (state, Nigeria)

    Plateau, state, east-central Nigeria, created in 1976 out of the northern half of former Benue-Plateau state. It is bounded by the states of Kaduna and Bauchi on the north, Taraba on the east, and Nassarawa on the south and west. The Jos Plateau rises to about 5,250 feet (1,600 m) above sea level

  • plateau (landform)

    Plateau, extensive area of flat upland usually bounded by an escarpment (i.e., steep slope) on all sides but sometimes enclosed by mountains. The essential criteria for plateaus are low relative relief and some altitude. Although plateaus stand at higher elevation than surrounding terrain, they

  • Plateau Central (region, Hispaniola)

    Haiti: Relief and drainage: …interior basin, known as the Central Plateau in Haiti and the San Juan Valley in the Dominican Republic, occupies about 150 square miles (390 square km) in the centre of the country. The plateau has an average elevation of about 1,000 feet (300 metres), and access to it is difficult…

  • Plateau conjecture (mathematics)

    analysis: Variational principles and global analysis: …the mathematical derivation of the Plateau conjecture, which states that, when several soap films join together (for example, when several bubbles meet each other along common interfaces), the angles at which the films meet are either 120 degrees (for three films) or approximately 108 degrees (for four films). Plateau had…

  • Plateau des Bolovens (plateau, Laos)

    Bolovens Plateau, fertile, gently rolling upland, southern Laos. The plateau lies east of Pakxé between the Mekong River and the western foothills of the southern Annamese Cordillera (Chaîne Annamitique). Basically a large, basaltic lava extrusion, about 3,500 feet (1,100 m) in elevation, the

  • Plateau Indian (people)

    Plateau Indian, member of any of the Native American peoples inhabiting the high plateau region between the Rocky Mountains and the coastal mountain system. The Plateau culture area comprises a complex physiographic region that is bounded on the north by low extensions of the Rocky Mountains, such

  • Plateau of the Chotts (region, North Africa)

    Algeria: Relief: …and are separated by the High Plateau (Hauts Plateaux). The south, consisting of the Sahara, is a solid and ancient platform of basement rock, horizontal and uniform. This region is uninhabited desert with the exception of several oases, but it conceals rich mineral resources, most significantly petroleum and natural gas.

  • plateau phase (physiology)

    sexual intercourse: In the plateau stage, breathing becomes more rapid and the muscles continue to tense. The glans at the head of the penis swells and the testes enlarge in the male. In the female, the outer vagina contracts and the clitoris retracts.

  • Plateau problem (mathematics)

    Plateau problem, in calculus of variations, problem of finding the surface with minimal area enclosed by a given curve in three dimensions. This family of global analysis problems is named for the blind Belgian physicist Joseph Plateau, who demonstrated in 1849 that the minimal surface can be

  • Plateau Shoshonean languages

    Numic languages, North American Indian languages spoken by Native Americans in what are now the U.S. states of Nevada, Utah, California, Oregon, Idaho, Wyoming, Arizona, Colorado, and Oklahoma. In the early 21st century, these languages were usually divided into three groups: Western Numic,

  • plateau stage (physiology)

    sexual intercourse: In the plateau stage, breathing becomes more rapid and the muscles continue to tense. The glans at the head of the penis swells and the testes enlarge in the male. In the female, the outer vagina contracts and the clitoris retracts.

  • Plateau, Joseph Antoine Ferdinand (Belgian physicist)

    animation: Early history: …devices, invented by the Belgian Joseph Plateau in 1832, was the phenakistoscope, a spinning cardboard disk that created the illusion of movement when viewed in a mirror. In 1834 William George Horner invented the zoetrope, a rotating drum lined by a band of pictures that could be changed. The Frenchman…

  • plateau, oceanic (geology)

    Oceanic plateau, large submarine elevation rising sharply at least 200 m (660 feet) above the surrounding deep-sea floor and characterized principally by an extensive, relatively flat or gently tilted summit. Most oceanic plateaus were named early in the 20th century prior to the invention of

  • platelet (blood cell)

    Platelet, colourless, nonnucleated blood component that is important in the formation of blood clots (coagulation). Platelets are found only in the blood of mammals. Platelets are formed when cytoplasmic fragments of megakaryocytes, which are very large cells in the bone marrow, pinch off into the

  • platelet ice (ice formation)

    sea ice: Sea ice formation and features: Platelet ice is perhaps the most exotic form of sea ice besides marine ice. In Antarctica, where cold, relatively low-salinity seawater flows out from beneath ice shelves, platelet ice grows both in the water column and at the bottom of the sea ice on the…

  • platelet plug (biology)

    bleeding and blood clotting: Significance of hemostasis: …(2) the formation of a platelet plug, and (3) changes associated with the wall of the blood vessel after injury of its cells. In humans, defects in any of these processes may result in persistent bleeding from slight injuries, or, alternatively, in an overreaction that causes the inappropriate formation of…

  • platelet transfusion (biology)

    therapeutics: Blood and blood cells: Platelet transfusions are used to prevent bleeding in patients with very low platelet counts, usually less than 20,000 cells per microlitre, and in those undergoing surgery or other invasive procedures whose counts are less than 50,000 cells per microlitre.

  • platen press (printing)

    printing: Platen presses: Presses that operate plane to plane are called platen presses. A vertical clamping contrivance clamps the bed, which carries the form into which the composed type is locked, and the platen, which carries the sheet of paper while it is being printed. When…

  • Platen, August, Graf von (German writer)

    August, Graf von Platen, German poet and dramatist who was almost unique among his contemporaries in aiming at classical purity of style; although he was schooled in the Romantic tradition, he opposed its undisciplined flamboyance. Platen entered the Bavarian life guards in 1814 and attended the

  • Platen-Hallermund, August, Graf von (German writer)

    August, Graf von Platen, German poet and dramatist who was almost unique among his contemporaries in aiming at classical purity of style; although he was schooled in the Romantic tradition, he opposed its undisciplined flamboyance. Platen entered the Bavarian life guards in 1814 and attended the

  • Platen-Hallermünde, August, Graf von (German writer)

    August, Graf von Platen, German poet and dramatist who was almost unique among his contemporaries in aiming at classical purity of style; although he was schooled in the Romantic tradition, he opposed its undisciplined flamboyance. Platen entered the Bavarian life guards in 1814 and attended the

  • Plateosaurus (dinosaur genus)

    Plateosaurus, (genus Plateosaurus), dinosaurs known from extensive fossil material found in Europe dating to the Late Triassic Period (about 229 million to 200 million years ago) that were representative of the prosauropods, an early group that might have been ancestral to the giant sauropod

  • Plater, Alan Frederick (British dramatist and screenwriter)

    Alan Frederick Plater, British dramatist and screenwriter (born April 15, 1935, Jarrow, Eng.—died June 25, 2010, London, Eng.), wrote skillful, naturalistic dialogue for television, theatre, film, and radio in a prolific career spanning six decades. He was best known for his TV scripts for such

  • Plater-Zyberk, Elizabeth (American architect)

    Andrés Duany and Elizabeth Plater-Zyberk: Plater-Zyberk was the daughter of émigrés who escaped communist Poland in the late 1940s. They both earned undergraduate degrees in architecture and urban planning from Princeton University and graduate degrees in architecture from the Yale School of Architecture. They moved to southern Florida in 1975,…

  • Plateresco (architecture)

    Plateresque, (“Silversmith-like”), main architectural style in Spain during the late 15th and the 16th centuries, also used in Spain’s American colonies. Cristóbal de Villalón first used the term in 1539 while comparing the richly ornamented facade of the Cathedral of León to a silversmith’s

  • Plateresque (architecture)

    Plateresque, (“Silversmith-like”), main architectural style in Spain during the late 15th and the 16th centuries, also used in Spain’s American colonies. Cristóbal de Villalón first used the term in 1539 while comparing the richly ornamented facade of the Cathedral of León to a silversmith’s

  • Platero and I (work by Jiménez)

    Juan Ramón Jiménez: …translation of his prose work Platero y yo (1917; Platero and I), the story of a man and his donkey. He also collaborated with his wife in the translation of the Irish playwright John Millington Synge’s Riders to the Sea (1920). His poetic output during his life was immense. Among…

  • Platero y yo (work by Jiménez)

    Juan Ramón Jiménez: …translation of his prose work Platero y yo (1917; Platero and I), the story of a man and his donkey. He also collaborated with his wife in the translation of the Irish playwright John Millington Synge’s Riders to the Sea (1920). His poetic output during his life was immense. Among…

  • plateway (transportation)

    railroad: Source in inland water transport: …the late Middle Ages, the plateway, suggested a means to make steam-powered land transport practicable. In central Europe most of the common metals were being mined by the 16th and 17th centuries, but, because they occurred in low concentrations, great tonnages of ore had to be mined to produce small…

  • platform (architecture)

    Mesopotamian art and architecture: Architecture: …artificially raised up on a platform level with the tops of the city walls, astride which they often stand. Their gates are flanked by colossal portal sculptures in stone, and their internal chambers are decorated with pictorial reliefs carved on upright stone slabs, or orthostats. In addition to the 9th-century…

  • platform (politics)

    presidency of the United States of America: Presidential nominating conventions: …that the parties draft their platforms, which set out the policies of each party and its presidential candidate. The convention also serves to unify each party after what may have been a bitter primary season. Finally, the conventions mark the formal start of the general election campaign (because the nominees…

  • platform (vessel)

    undersea exploration: Platforms: Undersea exploration of any kind must be conducted from platforms, in most cases, ships, buoys, aircraft, or satellites. Typical oceanographic vessels capable of carrying out a full complement of underwater exploratory activities range in size from about 50 to 150 metres. They support scientific…

  • platform (geology)

    Asia: Tectonic framework: The continental nuclei consist of platforms that stabilized mostly in Precambrian time (between roughly 4 billion and 541 million years ago) and have been covered largely by little-disturbed sedimentary rocks; included in that designation are the Angaran (or East Siberian), Indian, and Arabian platforms. There are also several smaller platforms…

  • platform bower (shelter)

    bowerbird: …a thick pad of plant material, ringed or hung about with objects, made by Archbold’s bowerbird (Archboldia papuensis). The stagemaker, or tooth-billed catbird (Scenopoeetes dentirostris), of forests of northeastern Australia, arranges leaves silvery-side up (withered ones are carried aside) to form a “circus ring.”

  • platform frame (construction)

    construction: Timber frames: These present-day “platform” frames are made of standard-dimension timbers, usually two or four centimetres (0.75 or 1.5 inch) thick, which are joined together by machine-made nails and other metal fasteners using hand tools.

  • platform game, electronic (electronic game genre)

    Electronic platform game, electronic game genre characterized by maneuvering a character from platform to platform by jumping, climbing, and swinging in order to reach some final destination. The first genuine platform game was Nintendo Company Ltd.’s Donkey Kong (1981), an arcade game in which

  • platform paddle tennis (sport)

    Platform tennis, sport that is a combination of tennis and squash, devised in 1928 by American sports enthusiasts Fessenden Blanchard and James Cogswell at Scarsdale, N.Y. It is played on specially constructed platforms, 60 by 30 feet (18 by 9 m), surrounded by back and side walls of tightly

  • platform reef (coral reef)

    Platform reef, a coral reef found on continental shelves and characterized by a primarily radial growth pattern. A platform reef may or may not lie behind a barrier reef and may undergo elongation if established on a sandbank. Reefs grow actively outward as well as upward, especially in the stable

  • platform rocker (furniture)

    Platform rocker, rocking chair with rockers fixed to move on a stationary base rather than on the floor. Introduced in the United States about 1870, it soon achieved popularity, partly because the movable section of the chair could be kept at a comfortable angle without oscillating. The base of the

  • Platform Scripture (Chinese Buddhism)

    Platform Sutra, important text from the Ch’an (Zen) school of Chinese Buddhism, most likely composed in the 8th century ce. It is attributed to the sixth patriarch of the Ch’an tradition, Hui-neng (638–713), although it is most likely the work of subsequent disciples who sought to legitimate their

  • Platform Scripture of the Sixth Patriarch (Chinese Buddhism)

    Platform Sutra, important text from the Ch’an (Zen) school of Chinese Buddhism, most likely composed in the 8th century ce. It is attributed to the sixth patriarch of the Ch’an tradition, Hui-neng (638–713), although it is most likely the work of subsequent disciples who sought to legitimate their

  • platform stage (theatre)

    Open stage, theatrical stage without a proscenium, projecting into the audience and surrounded on three sides by the audience. The open stage was used in the corrales of Spain’s Golden Age of theatre (beginning about 1570) and in the traditional Noh theatre of Japan. It was also used in the first

  • Platform Sutra (Chinese Buddhism)

    Platform Sutra, important text from the Ch’an (Zen) school of Chinese Buddhism, most likely composed in the 8th century ce. It is attributed to the sixth patriarch of the Ch’an tradition, Hui-neng (638–713), although it is most likely the work of subsequent disciples who sought to legitimate their

  • platform tennis (sport)

    Platform tennis, sport that is a combination of tennis and squash, devised in 1928 by American sports enthusiasts Fessenden Blanchard and James Cogswell at Scarsdale, N.Y. It is played on specially constructed platforms, 60 by 30 feet (18 by 9 m), surrounded by back and side walls of tightly

  • platform, wave-cut (coastal feature)

    Wave-cut platform, gently sloping rock ledge that extends from the high-tide level at the steep-cliff base to below the low-tide level. It develops as a result of wave abrasion; beaches protect the shore from abrasion and therefore prevent the formation of platforms. A platform is broadened as

  • platform-based development (computer science)

    computer science: Platform-based development: Platform-based development is concerned with the design and development of applications for specific types of computers and operating systems (“platforms”). Platform-based development takes into account system-specific characteristics, such as those found in Web programming, multimedia development, mobile application development, and

  • Platforma Obywatelska (political party, Poland)

    Poland: Poland in the 21st century: …was defeated by the centre-right Civic Platform party, which under the premiership of Donald Tusk formed a coalition government with the PSL.

  • Plath, Sylvia (American author)

    Sylvia Plath, American poet whose best-known works, such as the poems “Daddy” and “Lady Lazarus” and the novel The Bell Jar, starkly express a sense of alienation and self-destruction closely tied to her personal experiences and, by extension, the situation of women in mid-20th-century America.

  • Platian Shield (geology)

    continental shield: …are designated the Guiana and Platian shields, respectively.

  • Platichthys flesus (fish)

    flounder: …the family Pleuronectidae are the European flounder (Platichthys flesus), a marine and freshwater food and sport fish of Europe that grows to a length of 50 cm (20 inches) and weight of 2.7 kg (6 pounds); the starry flounder (Platichthys stellatus), a North Pacific species that averages about 9 kg…

  • Platichthys stellatus (fish)

    flounder: 7 kg (6 pounds); the starry flounder (Platichthys stellatus), a North Pacific species that averages about 9 kg (20 pounds) in weight; and the winter flounder (Pseudopleuronectes americanus), an American Atlantic food fish, growing to about 60 cm (23 inches) in length. Flounders in that family typically have the eyes…

  • platina del Pinto (mineralogy)

    platinum group: History: The pebbles became known as platina del Pinto—that is, granules of silvery material from the Pinto River, a tributary of the San Juan River in the Chocó region of Colombia.

  • plating (metallurgy)

    Plating, coating a metal or other material such as plastic or china with a hard, nonporous metallic surface to improve durability and beauty. Such surfaces as gold, silver, stainless steel, palladium, copper, and nickel are formed by dipping an object into a solution containing the desired surface

  • Platini, Michel (French football player and administrator)

    Michel Platini, French professional football (soccer) player and administrator who was named the European Footballer of the Year three times (1983–85) and served as president of the Union of European Football Associations (UEFA; 2007–16). Platini made his French first-division debut with AS Nancy

  • Platini, Michel François (French football player and administrator)

    Michel Platini, French professional football (soccer) player and administrator who was named the European Footballer of the Year three times (1983–85) and served as president of the Union of European Football Associations (UEFA; 2007–16). Platini made his French first-division debut with AS Nancy

  • platinic chloride (chemical compound)

    Hexachloroplatinic acid (H2PtCl6∙6H2O), complex compound formed by dissolving platinum metal in aqua regia (a mixture of nitric and hydrochloric acids) or in hydrochloric acid that contains chlorine. It is crystallized from the solution in the form of reddish brown deliquescent (moisture-absorbing)

  • platiniridium (alloy)

    iridium: …to 77 percent iridium, in platiniridium up to 77 percent, in aurosmiridium 52 percent, and in native platinum up to 7.5 percent. Iridium generally is produced commercially along with the other platinum metals as a by-product of nickel or copper production.

  • platinum (chemical element)

    Platinum (Pt), chemical element, the best known and most widely used of the six platinum metals of Groups 8–10 (VIIIb), Periods 5 and 6, of the periodic table. A very heavy, precious, silver-white metal, platinum is soft and ductile and has a high melting point and good resistance to corrosion and

  • Platinum Blonde (film by Capra [1931])

    Frank Capra: The early 1930s: …one of the writers of Platinum Blonde (1931). Jean Harlow and Loretta Young starred in this comedy of manners, which owed much to Lewis Milestone’s The Front Page (1931) and foreshadowed the romances between female journalists and regular guys that would be at the centre the later Capra-Riskin efforts Mr.…

  • platinum group (chemical element group)

    Platinum group, six metals, in order of increasing atomic weight, ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), and platinum (Pt). The elements all possess a silvery white colour—except osmium, which is bluish white. The chemical behaviour of these metals is paradoxical

  • platinum resistance thermometer (instrument)

    undersea exploration: Water sampling for temperature and salinity: …a tiny thermistor with a platinum-resistance thermometer. Its operations are carried out in such a way as to fully exploit the fast response of the thermistor and the high accuracy of the platinum thermometer. In addition, the system uses a strain gauge as a pressure sensor, the gauge being adjusted…

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