unsaturated fatty acid

In chemistry, especially biochemistry, a fatty acid is a carboxylic acid often with a long unbranched aliphatic tail (chain), which is either saturated or unsaturated. Carboxylic acids as short as butyric acid (4 carbon atoms) are considered to be fatty acids, whereas fatty acids derived from natural fats and oils may be assumed to have at least 8 carbon atoms, e.g., caprylic acid (octanoic acid). Most of the natural fatty acids have an even number of carbon atoms, because their biosynthesis involves acetyl-CoA, a coenzyme carrying a two-carbon-atom group (see fatty acid synthesis). In industry, fatty acids are produced by the hydrolysis of the ester linkages in a fat or biological oil (both of which are triglycerides), with the removal of glycerol. See oleochemicals.
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Unsaturated fatty acid n. A fatty acid, such as oleic acid, whose carbon chain possesses one or more double or triple bonds and hence can [more]Unsaturated fatty acid - Community and Resources

Noun
1. a fatty acid whose carbon chain can absorb additional hydrogen atoms
(hypernym) fatty acid
(hyponym) monounsaturated fatty acid

Fatty acid whose hydrocarbon chain contains at least one double bond. Monounsaturated fatty acids contain one double bond; polyunsaturated fatty acids contain tow or more.