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Aldehyde "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.

2. (Chem.) Any compound having the group . Methyl
aldehyde, the simplest aldehyde, is more commonly called
formaldehyde, , and acetic aldehyde is now more
commonly called . The higher aldehydes may
be solids. A 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 , or
), ; methyl aldehyde (called
also ), .
[1913 Webster +PJC]
(Chem.), a compound formed by the union of
aldehyde with ammonia.
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