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Wordnet 3.0

NOUN (1)

1. a colorless poisonous gas; made by the oxidation of methanol;
[syn: formaldehyde, methanal]


The Collaborative International Dictionary of English v.0.48:

Formaldehyde \For*mal"de*hyde\, n. [Formic + aldehyde.] (Chem.) A colorless, volatile liquid, H2CO, resembling acetic or ethyl aldehyde, and chemically intermediate between methyl alcohol and formic acid. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

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. [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]
WordNet (r) 3.0 (2006):

formaldehyde n 1: a colorless poisonous gas; made by the oxidation of methanol [syn: formaldehyde, methanal]