The Collaborative International Dictionary
Trigamous
Trigamous \Trig"a*mous\, a. [L. trigamus a thrice-married man, Gr. ? thrice married; ? (see Tri-) + ? marriage: cf. F. trigame.] (Bot.) Having three sorts of flowers in the same head, -- male, female, and hermaphrodite, or perfect, flowers.
Wiktionary
trigamous
a. Living in or involving trigamy.