An unsaturated fatty acid whose carbon chain has one double or triple valence bond per molecule; found chiefly in olive oil and chicken and almonds WordNet 3.0 & Open English WordNet

In biochemistry and nutrition, a monounsaturated fat is a fat that contains a monounsaturated fatty acid, a subclass of fatty acid characterized by having a double bond in the fatty acid chain with all of the remaining carbon atoms being single-bonded. Wikipedia

Fat primarily consisting of monounsaturated fatty acids Wikidata

any fatty acid having only one double or triple bond within the carbon chain Wikidata