/ Dictionary / Index O orthros: Meaning and Definition of Find definitions for: or•thros Pronunciation: (ôr'thrôsEng.ôr'thros), [key] the morning office, corresponding to matins. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthoxylene Ortler Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language