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Meaning of orthochromatic

or•tho•chro•mat•ic

Pronunciation: (ôr"thu-krō-mat'ik, -thō-kru-), [key]
— adj. Photog.
  1. representing correctly the relations of colors as found in a subject; isochromatic.
  2. (of an emulsion) sensitive to all visible colors except red; isochromatic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.