GNU Collaborative International Dictionary of English

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1.       
   ‖Purpura , n. [L., purple, purple fish: cf. F. purpura. See Purple.]
   (Med.) A disease characterized by livid spots on the skin from extravasated blood, with loss of muscular strength, pain in the limbs, and mental dejection; the purples.
   Dunglison.
   
   1913 Webster
   (Zool.) A genus of marine gastropods, usually having a rough and thick shell. Some species yield a purple dye.
   1913 Webster