Etymology
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aldehyde (n.)

first oxidation product of alcohol, 1833, discovered in 1774 by German-born Swedish chemist Carl Wilhelm Scheele, the name said to have been coined by German chemist Justus von Liebig from abbreviation of Modern Latin alcohol dehydrogenatum "dehydrogenated alcohol." Related: Aldehydic.

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Definitions of aldehyde

aldehyde (n.)
any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids;
From wordnet.princeton.edu