a volatile, colorless, water-soluble liquid, C 2 H 4 O, having a pungent, fruitlike odor: used chiefly in the silvering of mirrors and in organic synthesis.
Historical Examples

The decomposition of pyruvic acid into acetaldehyde and carbon dioxide has already been fully discussed (Chapter VI).
Alcoholic Fermentation Arthur Harden

Starting in the one case with fused paraldehyde, and in the other case with acetaldehyde, the same freezing point, viz.
The Phase Rule and Its Applications Alexander Findlay

For this reason it is possible to determine the freezing point curves of acetaldehyde and paraldehyde.
The Phase Rule and Its Applications Alexander Findlay

This is in harmony with the fact that the polymerisation of acetaldehyde is accompanied by evolution of heat.
The Phase Rule and Its Applications Alexander Findlay

acetaldehyde is not of much importance in itself, but is useful as a transition.
Creative Chemistry Edwin E. Slosson

acetaldehyde, which is halfway between alcohol and acid, may also be easily oxidized to acetic acid.
Creative Chemistry Edwin E. Slosson

The substance investigated was acetaldehyde, C2H4O, in its relation to paraldehyde, a polymeric modification.
Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 8 Various

a colourless volatile pungent liquid, miscible with water, used in the manufacture of organic compounds and as a solvent and reducing agent. Formula: CH3CHO Systematic name ethanal

acetaldehyde ac·et·al·de·hyde (ās’ĭ-tāl’də-hīd’)
A colorless, flammable liquid formed during ethanol metabolism and yeast fermentation of organic compounds and used to manufacture acetic acid and drugs. Also called aldehyde, ethaldehyde.
A colorless, flammable liquid, used to manufacture acetic acid, perfumes, and drugs. Chemical formula: C2H4O.

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