/ Dictionary / Index O omn. hor.: Meaning and Definition of Find definitions for: omn. hor. Pronunciation: [key] (in prescriptions) every hour. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. omn. bih. omni- Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language