/ Dictionary / Index O opah: Meaning and Definition of Find definitions for: o•pah Pronunciation: (ō'pu), [key] — n. a large, deep-bodied, brilliantly colored, oceanic food fish, Lampris regius. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: opah (Thesaurus) opacus opal Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language