arachidonicacid
ar·a·chi·don·ic acid (ăr'ə-kĭ-dŏnʹĭk) n.
An unsaturated fatty acid, C20H32O2, found in animal fats, that is essential in human nutrition and is a precursor in the biosynthesis of some prostaglandins.
  [From arachidic, of the groundnut, from New Latin Arachis, groundnut genus, from Greek arakis, arakid- diminutive of arakos, a leguminous plant.]

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Universalium. 2010.

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