Monounsaturated fat. Definition. noun, plural: monounsaturated fats. An unsaturated fatty acid that contains only one double or triple bond in the carbon chain, and believed to be a dietary fat that helps reduce LDL cholesterol in blood. Supplement. Foods rich in monounsaturated fats are almonds, peanut oil, olive oil, canola, and avocados.
acetone body, ketone body - a ketone that is an intermediate product of the breakdown of fats in the body; any of three compounds (acetoacetic acid, acetone, and/or beta-hydroxybutyric acid) found in excess in blood and urine of persons with metabolic disorders.
ketone. 1  any of a class of organic compounds containing a carbonyl group, CO, attached to two alkyl groups, as CH 3 COCH 3 or CH 3 COC 2 H 5 2  . containing the ketone group.