What is "trimorph"

Trimorph \Tri"morph\, n. [See Trimorphous.] (Crystallog.) A substance which crystallizes in three distinct forms, or which has three distinct physical states; also, any one of these distinct forms. See Trimorphism, 1.

n. 1 (context crystallography English) A substance which crystallizes in three distinct forms, or which has three distinct physical states. 2 (context crystallography English) Any of the three forms of such a substance.