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eicosanoid

(ī-kōsə-noid′)
n.
  1. Any of the physiologically active substances derived from arachidonic acid, including the prostaglandins, leukotrienes, and thromboxanes.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.