A water-soluble compound,CO(NH2)2,that is the major nitrogenous end product of protein metabolism and is the chief nitrogenous component of the urine in mammals and other organisms.

• 脲，尿素可溶水的化合物，CO（NH2）2，是蛋白质新陈代谢的主要氮成品，并且是哺乳动物和其他生物尿液中的主要含氮成分。