/ Dictionary / Index O orc: Meaning and Definition of Find definitions for: orc Pronunciation: (ôrk), [key] — n. any of several cetaceans, as a grampus. a mythical monster, as an ogre. O.R.C. Pronunciation: [key] Officers' Reserve Corps. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orby orca Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language