\Tri*mor"phism\, n. [See {Trimorphic}.]
1. (Crystallog.) 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}.
2. (Biol.) The co["e]xistence 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 parts; --
   contrasted with {polymorphism}, and dimorphism.
{Heterogonous trimporphism} (Bot.), that condition in which
   flowers of plants of the same species have three different
   lengths of stamens, short, medium, and long, the blossoms
   of one individual plant having short and medium stamens
   and a long style, those of another having short and long
   stamens and a style of medium length, and those of a third
   having medium and long stamens and a short style, the
   style of each blossom thus being of a length not
   represented by its stamens.