/ Dictionary / Index O orthochromatic: Meaning and Definition of Find definitions for: or•tho•chro•mat•ic Pronunciation: (ôr"thu-krō-mat'ik, -thō-kru-), [key] — adj. Photog. representing correctly the relations of colors as found in a subject; isochromatic. (of an emulsion) sensitive to all visible colors except red; isochromatic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. orthocephalic orthoclase Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language