Webster's English Dictionary

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urea

urea \yu.-'re--*\ \-'re--*l\ \-'re--ik\ n [NL, fr. F ure`e, fr. urine] : a 
   soluble weakly basic nitrogenous compound CO(NH2)2 that is  the chief solid 
   component of mammalian urine and an end product of protein decomposition, 
   is synthesized from carbon dioxide and ammonia, and is used esp. in 
   synthesis (as of resins and plastics) and in fertilizers and animal rations 
   - ure.al aj