/ Dictionary / Index O orch.: Meaning and Definition of Find definitions for: orch. Pronunciation: [key] orchestra. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orcein orchard Related Content Daily Word Quiz: impetuous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language