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 ]