‖Al‐ma″gra (�), n. [Sp. almagra, almagre, fr. Ar. al-maghrah red clay or earth.] A fine, deep red ocher, somewhat purplish, found in Spain. It is the sil atticum of the ancients. Under the name of Indian red it is used for polishing glass and silver.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.