Decompound \De`com*pound"\, v. t. [imp. & p. p. {Decompounded}; p. pr. & vb. n. {Decompounding}.] [Pref. de- (intens. in sense 1) + compound, v. t.] 1. To compound or mix with that is already compound; to compound a second time. 2. To reduce to constituent parts; to decompose. It divides and decompounds objects into . . . parts. --Hazlitt.