n. [ Pref. tri- + Gr. &unr_; color: cf. F. trichroïsme. ] (Min.) The quality possessed by some crystals of presenting different colors in three different directions. [ 1913 Webster ]
n. [ Gr. &unr_; two-colored; di- = di`s- twice + &unr_; color. ] (Opt.) The property of presenting different colors by transmitted light, when viewed in two different directions, the colors being unlike in the direction of unlike or unequal axes. [ 1913 Webster ]
n. [ Gr. &unr_; two-colored; di- = di`s- twice + &unr_; color. ] (Opt.) The property of presenting different colors by transmitted light, when viewed in two different directions, the colors being unlike in the direction of unlike or unequal axes. [ 1913 Webster ]
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