| acetaldehyde | (noun) a colorless volatile water-soluble liquid aldehyde used chiefly in the manufacture of acetic acid and perfumes and drugs | Synonyms: ethanal |
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| aldehyde | (noun) any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids | - |
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| atherodyde | (noun) a simple type of jet engine; must be launched at high speed | Synonyms: athodyd, flying drainpipe, ramjet, ramjet engine |
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| formaldehyde | (noun) a colorless poisonous gas; made by the oxidation of methanol | Synonyms: methanal |
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| furfuraldehyde | (noun) a liquid aldehyde with a penetrating odor; made from plant hulls and corncobs; used in making furan and as a solvent | Synonyms: furfural |
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| glyceraldehyde | (noun) a sweet crystalline aldehyde formed by the breakdown of sugars | Synonyms: glyceric aldehyde |
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| paraldehyde | (noun) a colorless liquid (a cyclic trimer of acetaldehyde) that is used as a sedative and a solvent | Synonyms: ethanal trimer |
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| propionaldehyde | (noun) a colorless liquid aldehyde | Synonyms: propanal |
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