/ Dictionary / Index O Ortho-Novum: Meaning and Definition of Find definitions for: Or•tho-No•vum Pronunciation: (ôr"thō-nō'vum), [key] — Pharm., Trademark. Pharm.,Trademark. a brand name for a tablet containing the progestogen norethindrone and an estrogen, used as an oral contraceptive. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthonormal orthopedic Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language