Eicosatetraenoic acid (ETA) designates any straight chain tetra-unsaturated 20-carbon fatty acid. These compound are classified as polyunsaturated fatty acids (PUFA). The pure compounds, which are rarely encountered, are colorless oils. Two isomers, both of them essential fatty acids, are of particular interest:
Some chemistry sources define 'arachadonic acid' to designate any of the eicosatetraenoic acids. However, almost all writings in biology, medicine, and nutrition limit the use of the term 'arachidonic acid' to all-cis-5,8,11,14-eicosatetraenoic acid (ω-6).
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