Leu‐cop″y‐rite (lū̍‐kŏp″ĭ‐rīt), n. [Leuco- + pyrites.] (Min.) A mineral of a color between white and steel-gray, with a metallic luster, and consisting chiefly of arsenic and iron.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.