(1) A salt of acetic acid in which the terminal hydrogen atom is replaced by a metal, as in copper acetate, Cu(CH3COO)2. (2) An ester of acetic acid where the substitution is by a radical as in ethyl acetate, CH3COOC2H5. In cellulose acetate the hydroxyl radicals of the cellulose are involved in the esterification.See Cellulose Acetate; Vinyl Acetate.