Entry 3 senses · 2 variants Webster, 1913 Decomposite · De·com·pos·ite · IPA /diːˈkɒmpəzɪt/ a. n. 01 a. Compounded more than once; compounded with things already composite. 1. Compounded more than once; compounded with things already composite. 2. See Decompound, a., 2.(Bot.) See: Decompound 02 n. Anything decompounded. 1. Anything decompounded. “Decomposites of three metals or more.” — Bacon.