| amidopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: aminopyrine |
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| aminopyrine | (noun) a white crystalline substance used as an analgesic and antipyretic | Synonyms: amidopyrine |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| chalcopyrite | (noun) a yellow copper ore (CuFeS2) made up of copper and iron sulfide | Synonyms: copper pyrites |
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| chlorpyrifos | (noun) a common organophosphate insecticide | - |
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| copyright | (noun) a document granting exclusive right to publish and sell literary or musical or artistic work | Synonyms: right of first publication |
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| methapyrilene | (noun) antihistamine used to treat allergic responses (as rhinitis or dermatitis or pruritus) | - |
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| phenazopyridine | (noun) analgesic (trade name Pyridium) used to treat urinary tract infections | Synonyms: Pyridium |
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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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| sulfapyridine | (noun) sulfa drug derived from pyridine and sulfanilamide | - |
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| triphosphopyridine | (noun) a pyridine ring with three phosphorus groups | - |
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