arachidonic acid(redirected from Arachnia propionica)
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An unsaturated fatty acid, C20H32O2, present in animal fats and synthesized by the body from linoleic acid, 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.]
(Biochemistry) a fatty acid occurring in animal cells: the metabolic precursor of several groups of biologically active substances, including prostaglandins