GNU Collaborative International Dictionary of English

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1.       
   ‖Almagra , 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.
   1913 Webster