| 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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| satyr | (noun) one of a class of woodland deities; attendant on Bacchus; identified with Roman fauns | Synonyms: forest god |
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| (noun) man with strong sexual desires | Synonyms: lech, lecher, letch |
| satyriasis | (noun) abnormally intense sexual desire in men | - |
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| scammonyroot | (noun) tropical American prostrate or climbing herbaceous perennial having an enormous starchy root; sometimes held to be source of the sweet potato | Synonyms: Ipomoea fastigiata, Ipomoea panurata, man-of-the-earth, manroot, wild potato vine, wild sweet potato vine |
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| skyrocket | (noun) sends a firework display high into the sky | Synonyms: rocket |
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| (noun) propels bright light high in the sky, or used to propel a lifesaving line or harpoon | Synonyms: rocket |
| spirogyra | (noun) freshwater algae consisting of minute filaments containing spiral chlorophyll bands | - |
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| styracosaur | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaurus |
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| styracosaurus | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaur |
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| styrax | (noun) any shrub or small tree of the genus Styrax having fragrant bell-shaped flowers that hang below the dark green foliage | - |
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| styrene | (noun) a colorless oily liquid; the monomer for polystyrene | Synonyms: cinnamene, phenylethylene, vinylbenzene |
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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| syringa | (noun) large hardy shrub with showy and strongly fragrant creamy-white flowers in short terminal racemes | Synonyms: mock orange, Philadelphus coronarius |
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| syringe | (noun) a medical instrument used to inject or withdraw fluids | - |
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| syringeful | (noun) the quantity that a syringe will hold. | - |
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| syrinx | (noun) the vocal organ of a bird | - |
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| (noun) a primitive wind instrument consisting of several parallel pipes bound together | Synonyms: pandean pipe, panpipe |
| syrup | (noun) a thick sweet sticky liquid | Synonyms: sirup |
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| tayra | (noun) long-tailed arboreal mustelid of Central America and South America | Synonyms: Eira barbara, taira |
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| tetraiodothyronine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, thyroxin, thyroxine |
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| thyreophoran | (noun) armored dinosaurs: stegosaurs and ankylosaurs | Synonyms: suborder Thyreophora, Thyreophora |
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| thyrocalcitonin | (noun) thyroid hormone that tends to lower the level of calcium in the blood plasma and inhibit resorption of bone | Synonyms: calcitonin |
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| thyroglobulin | (noun) an iodine containing protein that is obtained from the thyroid gland and exhibits the general properties of the globulins | - |
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| thyroid | (noun) located near the base of the neck | Synonyms: thyroid gland |
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| thyroidectomy | (noun) surgical removal of the thyroid gland | - |
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| thyroiditis | (noun) inflammation of the thyroid gland | - |
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| thyromegaly | (noun) abnormally enlarged thyroid gland; can result from underproduction or overproduction of hormone or from a deficiency of iodine in the diet | Synonyms: goiter, goitre, struma |
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| thyronine | (noun) a phenolic amino acid of which thyroxine is a derivative | - |
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| thyroprotein | (noun) a preparation made from iodinated protein and having an action similar to thyroxine | - |
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| thyrotoxicosis | (noun) an overactive thyroid gland; pathologically excessive production of thyroid hormones or the condition resulting from excessive production of thyroid hormones | Synonyms: hyperthyroidism |
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| thyrotrophin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotropic hormone, thyrotropin, TSH |
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| thyrotropin | (noun) anterior pituitary hormone that stimulates the function of the thyroid gland | Synonyms: thyroid-stimulating hormone, thyrotrophic hormone, thyrotrophin, thyrotropic hormone, TSH |
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| thyroxin | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxine |
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| thyroxine | (noun) hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation in cells | Synonyms: T, tetraiodothyronine, thyroxin |
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| thyrse | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrsus |
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| thyrsopteris | (noun) a terrestrial tree fern of South America | Synonyms: Thyrsopteris elegans |
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| thyrsus | (noun) a dense flower cluster (as of the lilac or horse chestnut) in which the main axis is racemose and the branches are cymose | Synonyms: thyrse |
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| tommyrot | (noun) pretentious or silly talk or writing | Synonyms: baloney, bilgewater, boloney, bosh, drool, humbug, taradiddle, tarradiddle, tosh, twaddle |
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| tributyrin | (noun) a bitter oily triglyceride of butyric acid; a form of butyrin | - |
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| triiodothyronine | (noun) thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smaller quantity; exerts the same biological effects as thyroxine but is more potent and briefer | Synonyms: liothyronine, T |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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| tyramine | (noun) amino acid derived from tyrosine; has a sympathomimetic action; found in chocolate and cola drinks and ripe cheese and beer | - |
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| tyrannicide | (noun) killing a tyrant | - |
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| tyrannid | (noun) a passerine bird of the suborder Tyranni | - |
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| tyrannosaur | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaurus, Tyrannosaurus rex |
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| tyrannosaurus | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaur, Tyrannosaurus rex |
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| tyranny | (noun) a form of government in which the ruler is an absolute dictator (not restricted by a constitution or laws or opposition etc.) | Synonyms: absolutism, authoritarianism, Caesarism, despotism, dictatorship, monocracy, one-man rule, shogunate, Stalinism, totalitarianism |
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| (noun) dominance through threat of punishment and violence | Synonyms: absolutism, despotism |
| tyrant | (noun) a cruel and oppressive dictator | Synonyms: autocrat, despot |
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| (noun) any person who exercises power in a cruel way | - |
| (noun) in ancient Greece, a ruler who had seized power without legal right to it | - |
| tyre | (noun) hoop that covers a wheel | Synonyms: tire |
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| tyro | (noun) someone new to a field or activity | Synonyms: beginner, initiate, novice, tiro |
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| tyrocidin | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidine |
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| tyrocidine | (noun) a basic polypeptide antibiotic derived from a soil bacterium; a major component of tyrothricin | Synonyms: tyrocidin |
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| tyrolean | (noun) soft green felt hat with a feather or brush cockade | Synonyms: tirolean |
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| tyrosine | (noun) an amino acid found in most proteins; a precursor of several hormones | - |
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