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Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: An omega-3 polyunsaturated fatty acid (PUFA), having 20 carbon atoms and 5 cis double bonds, that acts as a precursor for prostaglandin-3, thromboxane-3, and leukotriene-5 eicosanoids Full definition →
Etymology from Wiktionary, CC BY-SA 4.0.