/ Dictionary / Index O orthomolecular: Meaning and Definition of Find definitions for: or•tho•mo•lec•u•lar Pronunciation: (ôr"thō-mu-lek'yu-lur), [key] — adj. being or pertaining to the treatment of disease by increasing, decreasing, or otherwise controlling the intake of natural substances, esp. vitamins. Cf.(def. 1). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: orthomolecular (Thesaurus) orthokeratology orthomorphic projection Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language