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