Definify.com
Webster 1913 Edition
Purpura
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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.
2.
(Zool.)
A genus of marine gastropods, usually having a rough and thick shell. Some species yield a purple dye.