trimorphism

• ⇰ The property of crystallizing in three forms fundamentally distinct, as is the case with titanium dioxide, which crystallizes in the forms of >rutile >, >octahedrite >, and >brookite >. See Pleomorphism>.
• ⇰ The coëxistence among individuals of the same species of three distinct forms, not connected, as a rule, by intermediate gradations; the condition among individuals of the same species of having three different shapes or proportions of corresponding