Wiktionary
ketone body
n. (context biochemistry English) Any of several compounds that are intermediates in the metabolism of fatty acids; principally acetoacetate and acetone (together with hydroxybutyrate which is not a ketone)
WordNet
ketone body
n. 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 [syn: acetone body]