eicosanoid

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