/ Dictionary / Index T tetrarch: Meaning and Definition of Find definitions for: te•trarch Pronunciation: (te'trärk, tē'-), [key] — n. any ruler of a fourth part, division, etc. a subordinate ruler. one of four joint rulers or chiefs. the ruler of the fourth part of a country or province in the ancient Roman Empire. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. tetrapylon tetrasporangium Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language