n. 1. (Crystallog.) Same as Pleomorphism. [ 1913 Webster ]
2. (Biol.) (a) The capability of assuming different forms; the capability of widely varying in form. (b) Existence in many forms; the coexistence, in the same locality, of two or more distinct forms independent of sex, not connected by intermediate gradations, but produced from common parents. [ 1913 Webster ]