Urea

From DictionGloss

Urea is a nitrogen-containing substance normally cleared from the blood by the kidney; it is the chief solid component of mammalian urine and an end product of protein decomposition. Diseases that compromise kidney function often lead to increased blood levels of urea, which are measured by the blood urea nitrogen (BUN) test.

A form of nitrogen that converts readily to ammonium.

A soluble, weakly basic, nitrogenous compound used in the manufacture of resins and plastics.