Noun
a salt of carbamic acid that is used as a nitrogen fertilizer
Source: WordNetBecause the urea conversion is incomplete, the product must be separated from unchanged ammonium carbamate. Source: Internet
Synthesis Urea plant using ammonium carbamate briquettes, Fixed Nitrogen Research Laboratory, ca. 1930 The basic process, developed in 1922, is also called the Bosch–Meiser urea process after its discoverers. Source: Internet
From there, reconstituted ammonium carbamate liquor passes directly to the reactor. Source: Internet