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aldehyde n. 乙醛 乙醛 aldehyde n 1: any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acidsAldehyde \ Al" de* hyde\ ([ a^] l" d[- e]* h[ imac] d), n. [ Abbrev. fr. alcohol dehydrogenatum, alcohol deprived of its hydrogen.] 1. ( Chem.) A colorless, mobile, and very volatile liquid obtained from alcohol by certain processes of oxidation. [ 1913 Webster] 2. ( Chem.) Any compound having the group {- CHO}. Methyl aldehyde, the simplest aldehyde, is more commonly called formaldehyde, { H- CHO}, and acetic aldehyde is now more commonly called { acetaldehyde}. The higher aldehydes may be solids. A { reducing sugar} typically contains the aldehyde group. [ PJC] Note: The aldehydes are intermediate between the alcohols and acids, and differ from the alcohols in having two less hydrogen atoms in the molecule, as common aldehyde ( called also { acetaldehyde}, { acetic aldehyde} or { ethyl aldehyde}), { C2H4O}; methyl aldehyde ( called also { formaldehyde}), { CH2O}. [ 1913 Webster PJC] { Aldehyde ammonia} ( Chem.), a compound formed by the union of aldehyde with ammonia. [ 1913 Webster]
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