Webster's English Dictionary

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ammonia

am.mo.nia \*-'mo--ny*\ n [NL, fr. L sal ammoniacus sal ammoniac, lit., salt 
   of Ammon, fr. Gk am]mo-niakos of Ammon, fr. Ammo-n Ammon, Amen, an Egyptian 
   god near one of whose temples it was prepared 1: a pungent colorless 
   gaseous alkaline compound of nitrogen and hydrogen N H3 that is very 
   soluble in water and can easily be condensed by cold and pressure to a 
   liquid 2: AMMONIA WATER