<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>