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: any of a class of organic compounds having a carbonyl group linked to a carbon atom in each of two hydrocarbon radicals
gas ring: gas burner consisting of a circular metal pipe with several small holes through which gas can escape to be burned