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The Collaborative International Dictionary of English v.0.48 (gcide)

Acetic \A*ce"tic\ (#; 277), a. [L. acetum vinegar, fr. acere to
be sour.] (Chem.)
(a) Of a pertaining to vinegar; producing vinegar; producing
vinegar; as, acetic fermentation.
(b) Pertaining to, containing, or derived from, acetyl, as
acetic ether, acetic acid. The latter is the acid to
which the sour taste of vinegar is due.
[1913 Webster]