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  1. Oxford American Dictionary

    orthochromatic

    • IPA[ˌôrTHōkrəˈmadik]

    美式

    • adj.
      (of black-and-white photographic film) sensitive to all visible light except red. Orthochromatic film can therefore be handled in red light in the darkroom but does not produce black-and-white tones that correspond very closely to the colors seen by the eye.