/ Dictionary / Index T trimerous: Meaning and Definition of Find definitions for: trim•er•ous Pronunciation: (trim'ur-us), [key] — adj. (of flowers) having members in each whorl in groups of three. having three segments or parts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trimer trimester Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language