Di″chro‐ism (?), n. [Gr. � two-colored; δι- = δίσ- twice + � 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.