Breadcrumb Home > Dictionary > Index O orca: Meaning and Definition of Find definitions for: or•ca Pronunciation: (ôr'ku), [key] — n. the killer whale, Orcinus orca. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: orca (Thesaurus) orc orcein ✖ Related Content Daily Word Quiz: acronym Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language