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  • Pterocarpus santalinus (tree)

    sandalwood: …from the reddish-coloured wood of Pterocarpus santalinus, a Southeast Asian tree of the pea family (Fabaceae). This species may have been the source of the sandalwood used in King Solomon’s temple.

  • Pterocarya (plant)

    Wing nut, (genus Pterocarya), any of about six species of Asian trees of the walnut family (Juglandaceae). They often are 30 m (about 100 feet) tall and bear winged, edible, one-seeded nuts. One species, P. stenoptera, is planted as an ornamental. The wood of some species is used in

  • Pterocarya stenoptera (tree)

    wing nut: One species, P. stenoptera, is planted as an ornamental. The wood of some species is used in cabinetmaking.

  • Pterochroza ocellata (insect)

    katydid: Defense adaptations: The peacock katydid (Pterochroza ocellata), for example, precisely mimics the discoloration of a dead leaf.

  • Pterocletidae (bird)

    Sandgrouse, (order Pteroclidiformes), any of 16 species of birds of Asian and African deserts. According to some systems of classification, sandgrouse are ranked with the plovers within the order Charadriiformes. Sandgrouses are about 22 to 40 cm (about 9 to 16 inches) long and have gray or brown

  • Pteroclidae (bird)

    Sandgrouse, (order Pteroclidiformes), any of 16 species of birds of Asian and African deserts. According to some systems of classification, sandgrouse are ranked with the plovers within the order Charadriiformes. Sandgrouses are about 22 to 40 cm (about 9 to 16 inches) long and have gray or brown

  • Pteroclididae (bird)

    Sandgrouse, (order Pteroclidiformes), any of 16 species of birds of Asian and African deserts. According to some systems of classification, sandgrouse are ranked with the plovers within the order Charadriiformes. Sandgrouses are about 22 to 40 cm (about 9 to 16 inches) long and have gray or brown

  • Pteroclidiformes (bird)

    Sandgrouse, (order Pteroclidiformes), any of 16 species of birds of Asian and African deserts. According to some systems of classification, sandgrouse are ranked with the plovers within the order Charadriiformes. Sandgrouses are about 22 to 40 cm (about 9 to 16 inches) long and have gray or brown

  • Pterocnemia pennata (bird)

    rhea: …Brazil southward to Argentina, while Darwin’s rhea (Pterocnemia pennata) lives from Peru southward to Patagonia, at the tip of the continent. Both species are considerably smaller than the ostrich; the common rhea stands about 120 cm (4 feet) tall and weighs about 20 kg (50 pounds). The common rhea has…

  • pterodactyl (fossil reptile group)

    Pterodactyl, informal term for a subgroup of flying reptiles (Pterosauria) known from the Late Jurassic through Late Cretaceous periods (145 million to 65 million years ago). Pterodactyls, or, more correctly, pterodactyloids, are distinguished from basal pterosaurs by their reduced teeth, tail, and

  • pterodactyloid (fossil reptile group)

    Pterodactyl, informal term for a subgroup of flying reptiles (Pterosauria) known from the Late Jurassic through Late Cretaceous periods (145 million to 65 million years ago). Pterodactyls, or, more correctly, pterodactyloids, are distinguished from basal pterosaurs by their reduced teeth, tail, and

  • Pterodroma cahow (bird)

    petrel: …the endangered Bermuda petrel, or cahow (Pterodroma cahow, sometimes considered a race of P. hasitata); the dark-rumped petrel, also called the Hawaiian petrel (P. phaeopygia), another endangered species, now concentrated almost entirely on the island of Maui; the phoenix petrel (P. alba), which breeds on several tropical archipelagos; and the…

  • Pterodroma hasitata (bird)

    procellariiform: Importance to humans: The related black-capped petrel, or diablotin (P. hasitata), of the West Indies was also thought extinct (because of predation by humans, rats, and mongooses) until in 1961 a substantial population, estimated to number at least 4,000 birds, was found breeding in the inaccessible forested cliffs of Hispaniola.

  • Pterogeniidae (insect family)

    coleopteran: Annotated classification: Family Pterogeniidae Two Indo-Malayan genera of uncertain affinities. Family Pyrochroidae (fire-coloured beetles) Adults large; found on foliage or flowers, under bark; about 100 species in north temperate region; example Pyrochroa Family Pythidae

  • Pteroglossus (bird)

    Aracari, any of certain toucan species. See

  • Pterois (fish)

    Lionfish, (Pterois), any of several species of showy Indo-Pacific fishes of the scorpion fish family, Scorpaenidae (order Scorpaeniformes). Lionfish are noted for their venomous fin spines, which are capable of producing painful, though rarely fatal, puncture wounds. The fishes have enlarged

  • Pterois miles (fish)

    lionfish: …invaded by another lionfish species, Miles’ firefish (P. miles; also called the devil firefish). Miles’ firefish is native to the Indian Ocean, the Red Sea, and the Persian Gulf, but by 2016 it had also established at least one breeding population along the southern coast of Cyprus. Scientists suspect that…

  • Pterois volitans (fish)

    lionfish: …the best-known species is the red lionfish (Pterois volitans), an impressive fish sometimes kept by fish fanciers. It is striped with red, brown, and white and grows to about 30 cm (12 inches) long. The red lionfish is native to South Pacific reef ecosystems.

  • Pteromyinae (rodent)

    Flying squirrel, (tribe Pteromyini), any of more than 50 species of gliding squirrels. Three species are North American, two live in northern Eurasia, and all others are found in the temperate and tropical forests of India and other parts of Asia. Although these rodents do not fly, glides of up to

  • Pteronotus personatus (mammal)

    bat: Orientation: 0015 second), those of Wagner’s mustached bat (Pteronotus personatus) 4 milliseconds, and those of the greater horseshoe bat (Rhinolophus ferrumequinum) 55–65 milliseconds. In goal-oriented flight, such as the pursuit of an insect or the evaluation of an obstacle or a landing perch, the pulse duration is systematically altered (usually…

  • Pteronura brasiliensis (mammal)

    Saro, rare South American species of otter

  • Pterophoridae (insect)

    Plume moth, (family Pterophoridae), any of about 1,000 species of delicate moths (order Lepidoptera) that are named for the deep wing divisions that resemble plumes or lobes. The clefts in the wings divide them for about half their length, with the forewings usually divided into two plumes and the

  • Pterophoroidea (insect superfamily)

    lepidopteran: Annotated classification: Superfamily Pterophoroidea Almost 1,000 species in 1 family. Family Pterophoridae (plume moths) Almost 1,000 mainly tropical species; adults with very long, slender legs and bodies, the wings usually deeply cleft into plumes; larvae spin webs on and eat the leaves of various plants or bore into…

  • Pterophylla camellifolia (insect)

    katydid: The common true katydid (Pterophylla camellifolia) produces the repetitive song for which katydids are named; the song is phoneticized as “katy-did, katy-didn’t.” However, each species of katydid has its own rasping song, produced by stridulation, whereby the forewings, one of which is ridged, are rubbed together.…

  • Pterophyllum altum (fish)

    angelfish: eimekei, and P. altum. Angelfishes are native to the freshwaters of tropical South America and may grow to a length of about 15 cm (6 inches). They are commonly silvery with vertical dark markings but may be solid or partially black. They are carnivorous and take care…

  • Pterophyllum eimekei (fish)

    angelfish: scalare, P. eimekei, and P. altum. Angelfishes are native to the freshwaters of tropical South America and may grow to a length of about 15 cm (6 inches). They are commonly silvery with vertical dark markings but may be solid or partially black. They are carnivorous…

  • pteropod (mollusk)

    Pteropod, small marine gastropods of the subclass Opisthobranchia (phylum Mollusca) characterized by a foot modified to form a pair of winglike flaps (parapodia) that are used for swimming. They live at or near the sea surface; most are less than 1 cm (0.4 inch) long. Those that lack a shell and

  • pteropod ooze (marine deposit)

    ooze: …shells of planktonic foraminifera, and pteropod ooze, made up chiefly of the shells of pelagic mollusks. The siliceous oozes include radiolarian ooze, comprising essentially brown clay with more than 30 percent of the skeletons of warm-water protozoa, and diatom ooze, containing the frustules (tiny shells) of diatoms. The siliceous oozes…

  • pteropodid (mammal)

    Old World fruit bat, (family Pteropodidae), any of more than 180 species of large-eyed fruit-eating or flower-feeding bats widely distributed from Africa to Southeast Asia and Australia. Some species are solitary, some gregarious. Most roost in the open in trees, but some inhabit caves, rocks, or

  • Pteropodidae (mammal)

    Old World fruit bat, (family Pteropodidae), any of more than 180 species of large-eyed fruit-eating or flower-feeding bats widely distributed from Africa to Southeast Asia and Australia. Some species are solitary, some gregarious. Most roost in the open in trees, but some inhabit caves, rocks, or

  • pteropsid (plant)

    Pteropsid, any of a group of vascular plants (tracheophytes) that includes ferns, extinct seed ferns, gymnosperms (conifers, etc.), and angiosperms (flowering plants). Pteropsids manifest a great variety of vegetative and reproductive characteristics. For example, ferns produce spores, and

  • Pteropsida (plant)

    Pteropsid, any of a group of vascular plants (tracheophytes) that includes ferns, extinct seed ferns, gymnosperms (conifers, etc.), and angiosperms (flowering plants). Pteropsids manifest a great variety of vegetative and reproductive characteristics. For example, ferns produce spores, and

  • Pteroptochidae (bird family)

    Pteroptochidae, family of Latin American birds, based on the genus Pteroptochas—in this encyclopaedia classified as part of the tapaculo (q.v.) family

  • Pteropus (mammal)

    Flying fox, (genus Pteropus), any of about 65 bat species found on tropical islands from Madagascar to Australia and Indonesia and mainland Asia. They are the largest bats; some attain a wingspan of 1.5 metres (5 feet), with a head and body length of about 40 cm (16 inches). Flying foxes are Old

  • Pteropus giganteus (mammal)

    bat: Life cycle: …for five months in the Indian flying fox (Pteropus giganteus). By two months of age, most smaller bats have been flying and foraging for three or four weeks and have achieved adult size.

  • pterosaur (fossil reptile order)

    Pterosaur, any of the flying reptiles that flourished during all periods (Triassic, Jurassic, and Cretaceous) of the Mesozoic Era (252.2 million to 66 million years ago). Although pterosaurs are not dinosaurs, both are archosaurs, or “ruling reptiles,” a group to which birds and crocodiles also

  • Pterosauria (fossil reptile order)

    Pterosaur, any of the flying reptiles that flourished during all periods (Triassic, Jurassic, and Cretaceous) of the Mesozoic Era (252.2 million to 66 million years ago). Although pterosaurs are not dinosaurs, both are archosaurs, or “ruling reptiles,” a group to which birds and crocodiles also

  • Pterostylis (plant)

    Greenhood, (genus Pterostylis), genus of more than 100 species of terrestrial orchids (family Orchidaceae) native to Australasia. The plants occupy a wide range of habitats, from rainforest to open grasslands. Some species are cultivated by collectors for their unusual flowers. Greenhoods have

  • Pterostylis banksii (plant)

    greenhood: The hooded orchid (P. banksii) is native to New Zealand, and the closely related king greenhood (P. baptistii) is from neighbouring Australia.

  • Pterostylis baptistii (plant)

    greenhood: …Zealand, and the closely related king greenhood (P. baptistii) is from neighbouring Australia.

  • Pterostylis recurva (plant)

    greenhood: The jug orchid (Pterostylis recurva) is named for its shape. The hooded orchid (P. banksii) is native to New Zealand, and the closely related king greenhood (P. baptistii) is from neighbouring Australia.

  • Pterostyrax (plant genus)

    Pterostyrax, genus of about four species of deciduous trees or shrubs, of the storax family (Styracaceae), native to East Asia. A few species, notably P. hispidus and P. corymbosus, both of which are called the epaulette tree, are cultivated in other regions as ornamentals. The genus is

  • Pterostyrax corymbosus (tree)

    Pterostyrax: hispidus and P. corymbosus, both of which are called the epaulette tree, are cultivated in other regions as ornamentals. The genus is characterized by alternate stalked leaves and fragrant white flowers borne in large clusters. The five petals are separate. The fleshy fruit has one or two…

  • Pterostyrax hispidus (tree)

    Pterostyrax: A few species, notably P. hispidus and P. corymbosus, both of which are called the epaulette tree, are cultivated in other regions as ornamentals. The genus is characterized by alternate stalked leaves and fragrant white flowers borne in large clusters. The five petals are separate. The fleshy fruit has…

  • pteroylglutamic acid (vitamin)

    Folic acid, water-soluble vitamin of the B complex that is essential in animals and plants for the synthesis of nucleic acids. Folic acid was isolated from liver cells in 1943. The vitamin has a wide variety of sources in the human diet, including leafy green vegetables, citrus fruits, cereals,

  • pterygium (pathology)

    Pterygium, abnormal wing-shaped fold of the conjunctiva (the mucous membrane lining the eyelids and covering most of the front of the eyeball) that invades the surface of the cornea. Often preceded or accompanied by a pinguecula (yellowish growth in the conjunctiva), pterygia arise from the inner

  • pterygopalatine ganglion (physiology)

    human nervous system: Facial nerve (CN VII or 7): …nerve, they pass to the pterygopalatine ganglion via the greater petrosal nerve (a branch of the facial nerve) and to the submandibular ganglion by way of the chorda tympani nerve (another branch of the facial nerve, which joins the lingual branch of the mandibular nerve). Postganglionic fibres from the pterygopalatine…

  • Pterygota (insect subclass)

    insect: Insect phylogeny: …history of winged insects (Pterygota) throughout the geological periods from the Devonian to the Recent. The apterygotes, which are regarded as survivors of primitive insect stock, are omitted from the family tree. Dark lines indicate the periods during which the various orders have been found as fossils. Some lines…

  • Pterygotus buffaloenis (arthropod)
  • Pterygotus rhenanius (arthropod)
  • pteryla (anatomy)

    feather: …arranged in symmetrical tracts (pterylae) with areas of bare skin (apteria) between. The latter may contain the small soft feathers called down.

  • PTFE (chemical compound)

    Polytetrafluoroethylene (PTFE), a strong, tough, waxy, nonflammable synthetic resin produced by the polymerization of tetrafluoroethylene. Known by such trademarks as Teflon, Fluon, Hostaflon, and Polyflon, PTFE is distinguished by its slippery surface, high melting point, and resistance to attack

  • PTH (hormone)

    Parathyroid hormone (PTH), substance produced and secreted by the parathyroid glands that regulates serum calcium concentration. Under the microscope the PTH-producing cells, called chief cells, isolated from the parathyroid glands, occur in sheets interspersed with areas of fatty tissue.

  • PTI (news agency)

    Press Trust of India (PTI), news agency cooperatively owned by Indian newspapers, which joined together to take over the management of the Associated Press of India and the Indian outlets of the Reuters news agency of Great Britain. It began operating in February 1949 and is headquartered in

  • Ptilichthys goodei (fish)

    perciform: Annotated classification: Family Ptilichthyidae (quillfish) Extremely elongated, body ending in a free fleshy point; pelvic fins absent; dorsal and anal fins like vanes of a feather. 1 species (Ptilichthys goodei), rare; North Pacific. Family Zaproridae (prowfish) A single species (Zaprora silenus) like a shorter, deeper-bodied prickleback; pelvic fins

  • Ptiliidae (insect family)

    Feather-winged beetle, (family Ptiliidae), any of more than 400 species of beetles (insect order Coleoptera) characterized by long fringes of hair on the long, narrow hindwings. The antennae also have whorls of long hairs. Most feather-winged beetles are oval and between 0.25 and 1 mm (0.01 to 0.04

  • ptilinum (insect anatomy)

    housefly: …developed, expand a pouch (ptilinum) on the head and break off the end of the puparium to emerge.

  • Ptilium crista-castrensis (plant species)

    Feather moss, (Ptilium, formerly Hypnum, crista-castrensis), the only species of the genus Ptilium, it is a widely distributed plant of the subclass Bryidae that forms dense light green mats on rocks, rotten wood, or peaty soil, especially in mountain forests of the Northern Hemisphere. The erect

  • Ptilocercus lowii (mammal)

    tree shrew: …hair, but that of the pen-tailed tree shrew (Ptilocercus lowii) is hairless and ends in a featherlike tuft.

  • Ptilocerus ochraceus (insect)

    assassin bug: Predatory behaviour: …in the Southeast Asian species Ptilocerus ochraceus. It has since been observed among other Holoptilinae species, including Ptilocnemus femoralis and Ptilocnemus lemur.

  • Ptilodactylidae (insect family)

    coleopteran: Annotated classification: Family Ptilodactylidae About 200 tropical species; aquatic or in rotten wood. Superfamily Chrysomeloidea Mostly wood or plant feeders; body shape very variable; antennae not clubbed. Multiple families, the 2 largest described below. Family Cerambycidae (

  • ptilodictyoid (fossil cryptostome)

    moss animal: Evolution and paleontology: …or lacy colonies in the ptilodictyoids, or branching in rhabdomesoids, and were the dominant bryozoans from the start of the Devonian until the Permian (416 million to 299 million years ago). For reasons not yet clear, the cryptostomes dwindled and became extinct soon after the end of the Paleozoic Era…

  • Ptilodus (fossil mammal genus)

    Ptilodus, extinct genus of mammals found as fossils in deposits dated to the Paleocene Epoch (65.5–55.8 million years ago) of North America. Ptilodus was a multituberculate, a group of rodentlike mammals that were once the dominant herbivores and granivores in terrestrial ecosystems. The teeth of

  • Ptilogonatidae (bird)

    Silky flycatcher, (family Ptilogonatidae), any of four arboreal bird species found in dry, brushy regions from Nevada south to Panama that have silky feathers, prominent crests, and broad bills. They are about 19 cm (7.5 inches) long. Their basic diet consists of mistletoe berries, supplemented

  • Ptilogonys (bird genus)

    silky flycatcher: Ptilogonys species are gray with yellow sides, and the black-and-yellow silky flycatcher (Phainoptila melanoxantha) is similar, but the male has purplish black upper parts and the female a dark green back.

  • Ptilonorhynchidae (bird)

    Bowerbird, any of approximately 20 bird species that constitute the family Ptilonorhynchidae of the order Passeriformes. Bowerbirds are birds of Australia, New Guinea, and nearby islands that build more or less elaborate structures on the ground. Some are called catbirds, gardeners, and

  • Ptilonorhynchus violaceus (bird)

    bowerbird: Avenues are made by the satin bowerbird (Ptilonorhynchus violaceus); the regent bowerbird (Sericulus chrysocephalus) and its relatives; and the spotted bowerbird (Chlamydera maculata) and its relatives. Satin and regent bowerbirds make a paint of vegetable pulp, charcoal, and saliva and apply it to the interior walls; a daub of green…

  • ptiloris (bird)

    Riflebird, any of certain bird-of-paradise (q.v.)

  • Ptiloris paradiseus (bird)

    bird-of-paradise: victoriae) and the paradise riflebird (P. paradiseus)—prolonged hisses, like the passage of bullets through the air.

  • Ptiloris victoriae (bird)

    bird-of-paradise: …attributed to the calls of Queen Victoria’s riflebird (P. victoriae) and the paradise riflebird (P. paradiseus)—prolonged hisses, like the passage of bullets through the air.

  • Ptinidae (insect)

    Spider beetle, any member of about 500 species of insects sometimes considered a part of the family Anobiidae (order Coleoptera) and sometimes placed in their own family, Ptinidae. These spider-shaped beetles have a globular body, long thin legs, and no wings. They range in colour from reddish

  • Ptinus fur (insect)

    spider beetle: The white-marked spider beetle (Ptinus fur) and the shiny American spider beetle (Mezium americanum) are household pests in North America.

  • Ptisana (plant genus)

    Marattiaceae: Marattia, Ptisana, and Eupodium (the latter two having been formerly placed in Marattia) have the sporangia united in clusters called synangia, which are paired along each side of certain leaf veins and open toward the leaflet axis in this genus. Danaea has single synangia, sometimes extending…

  • PTL Club (American organization)

    Jerry Falwell: …unsuccessfully sought to revive the PTL (Praise the Lord) Club, the conservative Christian organization and television network of the disgraced televangelist Jim Bakker. Falwell advocated a conservative Christian faith and condemned what he perceived as the sinfulness and godlessness of contemporary society. A segregationist in his early years, he later…

  • PTM (plant anatomy)

    cycadophyte: Stem: …palms from activity of a primary thickening meristem (PTM) lateral to the apical meristem, which produces much greater increments of cortical parenchyma than would result if only an apical meristem were present. This is an important difference between cycadophytes and coniferophytes, for in the latter there is no PTM and…

  • Ptochoprodromus (Byzantine author)

    Theodore Prodromus, Byzantine writer, well known for his prose and poetry, some of which is in the vernacular. He wrote many occasional pieces for a widespread circle of patrons at the imperial court. Some of the work attributed to him is unpublished and some of it may be wrongly attributed to him.

  • Ptolemaeus (Gnostic author)

    patristic literature: The gnostic writers: …Flora, by the Valentinian gnostic Ptolemaeus (late 2nd century), supplying rules for interpreting the Mosaic Law (the Torah) in a Christian sense, and another disciple of Valentinus, Theodotus (2nd century), published an account of his master’s system that was excerpted by Clement of Alexandria.

  • Ptolemaeus, Claudius (Egyptian astronomer, mathematician, and geographer)

    Ptolemy, an Egyptian astronomer, mathematician, and geographer of Greek descent who flourished in Alexandria during the 2nd century ce. In several fields his writings represent the culminating achievement of Greco-Roman science, particularly his geocentric (Earth-centred) model of the universe now

  • Ptolemaic dynasty (Egyptian history)

    ancient Egypt: The Ptolemaic dynasty: Until the day when he openly assumed an independent kingship as Ptolemy I Soter, on November 7, 305 bce, Ptolemy used only the title satrap of Egypt, but the great hieroglyphic Satrap stela, which he had inscribed in 311 bce, indicates a degree…

  • Ptolemaic system (astronomy)

    Ptolemaic system, mathematical model of the universe formulated by the Alexandrian astronomer and mathematician Ptolemy about ad 150 and recorded by him in his Almagest and Planetary Hypotheses. The Ptolemaic system is a geocentric cosmology; that is, it starts by assuming that the Earth is

  • Ptolemaic tuning (music)

    tuning and temperament: Classic tuning systems: Ptolemaic tuning, often misleadingly named just intonation, sacrifices one of the fifths (D–A), which is altered to 40:27 from the simpler ratio 3:2, making it flat (too narrow) by a comma. The advantage of this system is that all the major thirds are true, or…

  • Ptolemaieia (ancient Egyptian festival)

    ancient Egypt: The Ptolemies (305–145 bce): …of a quadrennial festival, the Ptolemaieia, which was intended to enjoy a status equal to that of the Olympic Games. The festival was marked by a procession of amazingly elaborate and ingeniously constructed floats, with scenarios illustrating Greek religious cults.

  • Ptolemais (ancient city, Egypt)

    Ptolemy I Soter: King of Egypt: …only town he founded was Ptolemais in Upper Egypt. He probably placed Macedonian military commanders alongside the Egyptian provincial administrators and intervened unobtrusively in legal and financial affairs. In order to regulate the latter, he introduced coinage, which until that time was unknown in Egypt.

  • Ptolemais (Libya)

    Ptolemais, coastal city of ancient Cyrenaica (now part of Libya). The site was easily defensible and provided the only safe anchorage between Euhesperides-Berenice (modern Benghazi) and Apollonia (modern Sūsah in Libya). In the 3rd century bc the city received the name Ptolemais from Ptolemy III,

  • Ptolemy (Egyptian astronomer, mathematician, and geographer)

    Ptolemy, an Egyptian astronomer, mathematician, and geographer of Greek descent who flourished in Alexandria during the 2nd century ce. In several fields his writings represent the culminating achievement of Greco-Roman science, particularly his geocentric (Earth-centred) model of the universe now

  • Ptolemy (typeface)

    typography: The private-press movement: …semiroman of the 1460s, and Ptolemy, based upon a late 15th-century German model. The Ashendene Press books, like those of Morris, were often illustrated with wood engravings, and many had coloured initials.

  • Ptolemy Apion (ruler of Cyrenaica)

    Ptolemy Apion, ruler of Cyrenaica who separated it from Egypt and in his will bequeathed the country to Rome. Son of Ptolemy VIII Euergetes II, king of Egypt, by a concubine, Ptolemy Apion, according to classical sources, received Cyrenaica as his portion of his father’s will. Contemporary

  • Ptolemy Ceraunus (Macedonian prince of Egypt)

    Seleucid empire: …year, he was assassinated by Ptolemy Ceraunus, the disgruntled son of Ptolemy I.

  • Ptolemy I Soter (Macedonian king of Egypt)

    Ptolemy I Soter, Macedonian general of Alexander the Great, who became ruler of Egypt (323–285 bc) and founder of the Ptolemaic dynasty, which reigned longer than any other dynasty established on the soil of the Alexandrian empire and only succumbed to the Romans in 30 bc. Ptolemy was the son of

  • Ptolemy II Philadelphus (Macedonian king of Egypt)

    Ptolemy II Philadelphus, (Philadelphus in Greek: “Brother-Loving”) king of Egypt (285–246 bce), second king of the Ptolemaic dynasty, who extended his power by skillful diplomacy, developed agriculture and commerce, and made Alexandria a leading centre of the arts and sciences. Reigning at first

  • Ptolemy III Euergetes (Macedonian king of Egypt)

    Ptolemy III Euergetes, (Greek: Benefactor) Macedonian king of Egypt, son of Ptolemy II; he reunited Egypt and Cyrenaica and successfully waged the Third Syrian War against the Seleucid kingdom. Almost nothing is known of Ptolemy’s youth before 245, when, following a long engagement, he married

  • Ptolemy IV Philopator (Macedonian king of Egypt)

    Ptolemy IV Philopator, (Greek: “Loving His Father”) Macedonian king of Egypt (reigned 221–205 bc), under whose feeble rule, heavily influenced by favourites, much of Ptolemaic Syria was lost and native uprisings began to disturb the internal stability of Egypt. Classical writers depict Ptolemy as a

  • Ptolemy IX Soter II (Macedonian king of Egypt)

    Ptolemy IX Soter II, Macedonian king of Egypt (reigned 116–110, 109–107, and 88–81 bc) who, after ruling Cyprus and Egypt in various combinations with his brother, Ptolemy X Alexander I, and his mother, Cleopatra III, widow of Ptolemy VIII Euergetes II, gained sole rule of the country in 88 and

  • Ptolemy of Alexandria (Egyptian astronomer, mathematician, and geographer)

    Ptolemy, an Egyptian astronomer, mathematician, and geographer of Greek descent who flourished in Alexandria during the 2nd century ce. In several fields his writings represent the culminating achievement of Greco-Roman science, particularly his geocentric (Earth-centred) model of the universe now

  • Ptolemy of Mauretania (North African ruler)

    Ptolemy of Mauretania, North African client ruler for Rome (23–40 ce) who assisted Roman forces in suppressing a Berber revolt in Numidia and Mauretania but was assassinated in 40 ce after arousing the jealousy of the Roman emperor Caligula. He was the last known living descendant of the famous

  • Ptolemy Philadelphus (king of Syria and Asia Minor)

    Ptolemy Philadelphus, son of Mark Antony, the Roman triumvir of the East, and Cleopatra VII, queen of Egypt; in 30 bc he was exiled to Rome and later died there in obscurity. During his father’s triumph at Alexandria in 34 young Ptolemy was proclaimed king of Syria and Asia Minor. When Octavian,

  • Ptolemy Philopator Philometor Caesar (king of Egypt)

    Caesarion, king of Egypt (reigned 44–30 bce), son of Julius Caesar and Cleopatra VII. Ptolemy was his mother’s co-ruler, killed by Octavian, later the emperor Augustus, after Cleopatra’s death in 30. Ptolemy was the child of Cleopatra and Caesar, although a few classical authors, perhaps for

  • Ptolemy V Epiphanes (Macedonian king of Egypt)

    Ptolemy V Epiphanes , (Greek: Illustrious) Macedonian king of Egypt from 205 bc under whose rule Coele Syria and most of Egypt’s other foreign possessions were lost. After Sosibius, Ptolemy IV’s corrupt minister, had murdered Ptolemy V’s mother, the five-year-old king was officially elevated to the

  • Ptolemy VI Philometor (Macedonian king of Egypt)

    Ptolemy VI Philometor, (Greek: Loving His Mother) Macedonian king of Egypt under whom an attempted invasion of Coele Syria resulted in the occupation of Egypt by the Seleucids. After Roman intervention and several ventures of joint rule with his brother, however, Ptolemy was able to reunite his

  • Ptolemy VII Neos Philopator (king of Egypt)

    Ptolemy VII Neos Philopator, (Greek: Philopator, the Younger) younger son and co-ruler with Ptolemy VI Philometor, king of Egypt, whom he succeeded in 145 bc. Still a minor, he was the ward of his mother, who also served as his co-ruler. He was soon displaced by his uncle, Ptolemy VIII, who

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