/ Dictionary / Index T trierarch: Meaning and Definition of Find definitions for: tri•er•arch Pronunciation: (trī'u-rärk"), [key] — n. Gk. Hist. the commander of a trireme. (in Athens) a citizen who, singly, or jointly with other citizens, was required to fit out a trireme for the public service. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. trier trierarchy Related Content Daily Word Quiz: ablution Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language