The Collaborative International Dictionary
Trimorphic
Trimorphic \Tri*mor"phic\, Trimorphous \Tri*mor"phous\, a. [Gr. ? three-formed; ? (see Tri-) + morfh` form.] Of, pertaining to, or characterized by, trimorphism; -- contrasted with monomorphic, dimorphic, and polymorphic.
Wiktionary
trimorphic
a. 1 (context zoology English) Having three different forms with a clear attribute amongst three animals of the same species. 2 (context botany English) Having three different forms of flowers, leaf, or any other attribute on the same plant. 3 The condition of having three different forms.