[am.mo.nia] n [NL, fr. L sal ammoniacus sal ammoniac, lit., salt of Ammon, fr. Gk ammoniakos of Ammon, fr. Ammon Ammon, Amen, an Egyptian god near one of whose temples it was prepared] (ca. 1799) 1: a pungent colorless gaseous alkaline compound of nitrogen and hydrogen that is very soluble in water and can easily be condensed to a liquid by cold and pressure
2: ammonia water