[mass noun](Biochemistry)a colourless crystalline compound which is the main nitrogenous breakdown product of protein metabolism in mammals and is excreted in urine (生化)脲,尿素
Chem. formula: CO(NH2)2 化学分子式:CO(NH2)2
ureal adjective 语源
early 19th cent.: modern Latin, from French urée, from Greek ouron 'urine'