A volatile, colourless organic compound of the KETONE group produced by the partial oxidation of fatty acids. In some abnormal conditions, such as starvation, uncontrolled diabetes (see DIABETES MELLITUS) or prolonged vomiting, acetone and other ketones can accumulate in the blood. Acetone may then appear in the urine, along with beta-hydroxybutyric and aceotacic acids, a sign of developing COMA.