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From The Collaborative International Dictionary of English v.0.48:
Purpura \Pur"pu*ra\, n. [L., purple, purple fish: cf. F. purpura. See Purple.] 1. (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] 2. (Zool.) A genus of marine gastropods, usually having a rough and thick shell. Some species yield a purple dye. [1913 Webster]