acetol \ac"e*tol\, n. [Acetic + -ol as in alcohol.] (Chem.) 1. Methyl ketol; also, any of various homologues of the same. [Webster 1913 Suppl.] 1. [cap.] a trade name used at different times to represent different substances, as hydroxyacetone, acetylsalicylic acid, acetal, diethyl aldehyde, or cellulose acetate. --MI11 [PJC]