Wiktionary
ammonium carbamate
n. (context inorganic compound English) The ammonium salt of carbamic acid; it is used as a nitrogen fertilizer, and in the manufacture of urea
WordNet
ammonium carbamate
n. a salt of carbamic acid that is used as a nitrogen fertilizer
Wikipedia
Ammonium carbamate
Ammonium carbamate is a salt formed by the reaction of ammonia with carbon dioxide or carbamic acid. This compound is a white solid that is extremely soluble in water, soluble in alcohol, and only slightly volatile at room temperature. It is prepared by the direct reaction between liquid ammonia and dry ice (solid carbon dioxide):
2 NH( l) + CO( s) → HNCOONH