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thrombotic thrombocytopenic purpura

n.
  1. A disease of unknown origin, characterized by abnormally low levels of platelets in the blood, the formation of blood clots in the arterioles and capillaries of many organs, and neurological damage.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.