urea A white crystalline solid, CO(NH2)2, soluble in water, which is a major excretion product of protein metabolism in mammals. It is found in urine and other body fluids. Urea was the first organic substance to be synthesized in the laboratory (see Wöhler). Synthetic urea is used as fertilizer, in animal feed, and in resins. Related category • BIOCHEMISTRY Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |