(organic chemistry) Any salt or ester of acetic acid. / Cellulose acetate. / A transparent sheet used for overlays.

Sourness of taste, with bitterness and astringency, like that of unripe fruit. / Harshness, bitterness, or severity / (countable) Something harsh (e.g. a remark, act or experience).

(archaic) Sour, bitter, and harsh to the taste, such as unripe fruit. / (archaic, figuratively) Sharp and harsh in expressing oneself.

(organic chemistry, dated) acetaldehyde.

(organic chemistry, pharmacology) the amide derived from acetic acid and aniline; once used medicinally as an analgesic and antipyretic

(organic chemistry) Of, pertaining to, or producing vinegar / (organic chemistry) Of or pertaining to acetic acid or its derivatives

(organic chemistry) A colourless, volatile, flammable liquid ketone, (CH₃)₂CO, used as a solvent.

An oxyacetylene torch.

(pharmacology) The acetate ester of salicylic acid (aspirin)

(organic chemistry) A clear colourless organic acid, CH₃COOH, formed by the bacterial oxidation of ethanol through acetic fermentation; it is used as a solvent and has very many industrial applications; it is the major acidic component of vinegar.