<p><strong>Noun:</strong></p><ul><li>A compound, CO(NH₂)₂, occurring in urine and other body fluids as a product of protein metabolism.</li><li>A water-soluble powder form of this compound, obtained by the reaction of liquid ammonia and liquid carbon dioxide; used as a fertilizer, animal feed, in the synthesis of plastics, resins, and barbiturates, and in medicine as a diuretic and in the diagnosis of kidney function.</li></ul>