| pyracanth | (noun) any of various thorny shrubs of the genus Pyracantha bearing small white flowers followed by hard red or orange-red berries | Synonyms: fire thorn, firethorn, Pyracantha |
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| pyralid | (noun) usually tropical slender-bodied long-legged moth whose larvae are crop pests | Synonyms: pyralid moth |
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| pyramid | (noun) (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases | - |
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| (noun) a polyhedron having a polygonal base and triangular sides with a common vertex | - |
| pyramiding | (noun) a fraudulent business practice involving some form of pyramid scheme e.g., the chain of distribution is artificially expanded by an excessive number of distributors selling to other distributors at progressively higher wholesale prices until retail prices are unnecessarily inflated | - |
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| pyre | (noun) wood heaped for burning a dead body as a funeral rite | Synonyms: funeral pyre |
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| pyrectic | (noun) any substance that can cause a rise in body temperature | Synonyms: pyrogen |
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| pyrene | (noun) the small hard nutlet of a drupe or drupelet; the seed and the hard endocarp that surrounds it | - |
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| (noun) a pale yellow crystalline hydrocarbon C16H10 extracted from coal tar | - |
| pyrethrum | (noun) spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum coccineum, painted daisy, Tanacetum coccineum |
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| (noun) white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum | Synonyms: Chrysanthemum cinerariifolium, Dalmatia pyrethrum, Dalmatian pyrethrum, Tanacetum cinerariifolium |
| (noun) made of dried flower heads of pyrethrum plants | - |
| pyrexia | (noun) a rise in the temperature of the body; frequently a symptom of infection | Synonyms: febricity, febrility, fever, feverishness |
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| pyridine | (noun) a toxic colorless flammable liquid organic base with a disagreeable odor; usually derived from coal | - |
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| pyridoxal | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxamine, pyridoxine, vitamin B6 |
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| pyridoxamine | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxal, pyridoxine, vitamin B6 |
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| pyridoxine | (noun) a B vitamin that is essential for metabolism of amino acids and starch | Synonyms: adermin, pyridoxal, pyridoxamine, vitamin B6 |
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| pyrilamine | (noun) antihistamine used to treat rhinitis and pruritus | - |
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| pyrimidine | (noun) a heterocyclic organic compound with a penetrating odor | - |
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| (noun) any of several basic compounds derived from pyrimidine | - |
| pyrite | (noun) a common mineral (iron disulfide) that has a pale yellow color | Synonyms: fool's gold, iron pyrite |
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| pyrites | (noun) any of various metallic-looking sulfides (of which pyrite is the commonest) | - |
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| pyrocellulose | (noun) nitrocellulose containing less nitrogen than guncotton; used in making smokeless powder | - |
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| pyrochemistry | (noun) processes for chemical reactions at high temperatures | Synonyms: pyrochemical process |
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| pyroelectricity | (noun) generation of an electric charge on certain crystals (such as tourmaline) as a result of a change in temperature | - |
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| pyrogallol | (noun) a toxic white lustrous crystalline phenol used to treat certain skin diseases and as a photographic developer | Synonyms: pyrogallic acid |
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| pyrogen | (noun) any substance that can cause a rise in body temperature | Synonyms: pyrectic |
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| (noun) any substance characterized by its great flammability | - |
| pyrograph | (noun) a design produced by pyrography | - |
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| pyrographer | (noun) an artist who practices pyrography | - |
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| pyrography | (noun) the act of producing drawings on wood or leather by using heated tools or a fine flame | - |
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| pyrola | (noun) any of several evergreen perennials of the genus Pyrola | Synonyms: wintergreen |
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| pyrolatry | (noun) the worship of fire | Synonyms: fire-worship |
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| pyrolusite | (noun) a mineral consisting of manganese dioxide; an important source of manganese | - |
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| pyrolysis | (noun) transformation of a substance produced by the action of heat | - |
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| pyromancer | (noun) one who practices pyromancy | - |
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| pyromancy | (noun) divination by fire or flames | - |
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| pyromania | (noun) an uncontrollable desire to set fire to things | - |
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| pyromaniac | (noun) a person with a mania for setting things on fire | - |
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| pyrometer | (noun) a thermometer designed to measure high temperatures | - |
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| pyromorphite | (noun) a mineral consisting of lead chloride and phosphate; a minor source of lead | Synonyms: green lead ore |
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| pyrope | (noun) a deep red garnet used as a gemstone | - |
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| pyrophobia | (noun) a morbid fear of fire | - |
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| pyrophosphate | (noun) a salt or ester of pyrophosphoric acid | - |
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| pyrophyllite | (noun) a white or greenish aluminum silicate mineral (resembles talc) | - |
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| pyroscope | (noun) a pyrometer that uses the color of the light emitted by a hot object | Synonyms: optical pyrometer |
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| pyrosis | (noun) a painful burning sensation in the chest caused by gastroesophageal reflux (backflow from the stomach irritating the esophagus); symptomatic of an ulcer or a diaphragmatic hernia or other disorder | Synonyms: heartburn |
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| pyrostat | (noun) a thermostat that operates at very high temperatures | - |
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| pyrotechnic | (noun) (usually plural) a device with an explosive that burns at a low rate and with colored flames; can be used to illuminate areas or send signals etc. | Synonyms: firework |
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| pyrotechnics | (noun) the craft of making fireworks | Synonyms: pyrotechny |
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| (noun) (music) brilliance of display (as in the performance of music) | - |
| pyrotechny | (noun) the craft of making fireworks | Synonyms: pyrotechnics |
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| pyroxene | (noun) any of a group of crystalline silicate mineral common in igneous and metamorphic rocks | - |
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| pyroxylin | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxyline |
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| pyroxyline | (noun) highly flammable nitrocellulose used in making collodion and plastics and lacquers | Synonyms: pyroxylin |
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| pyrrhic | (noun) an ancient Greek dance imitating the motions of warfare | - |
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| (noun) a metrical unit with unstressed-unstressed syllables | Synonyms: dibrach |
| pyrrhotine | (noun) a brownish iron sulfide mineral (FeS) having weak magnetic properties | Synonyms: magnetic pyrites, pyrrhotite |
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| pyrrhotite | (noun) a brownish iron sulfide mineral (FeS) having weak magnetic properties | Synonyms: magnetic pyrites, pyrrhotine |
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| pyrrhuloxia | (noun) crested grey-and-red bird of southwest United States and Mexico | Synonyms: Pyrrhuloxia sinuata |
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