EICOSANOID

[ei.cos.a.noid] n [eicosa- containing 20 atoms (fr. Gk eikosa- twenty, fr. eikosi) + -noic, suffix used in names of fatty acids (fr. -ane + -oic) + [1]-oid--more at vigesimal] (1980): any of a class of compounds (as the prostaglandins) derived from polyunsaturated acids (as arachidonic acid) and involved in cellular activity