ammonia Ammonea • ammoniacal · · · Info · Definitions · Synonyms · Characters · · ammonia · · Text Latin · · Script 7 · · Length Definitions · · · (noun) a water solution of ammonia. Synonyms: ammonia water, ammonium hydroxide. · · Noun Definition 1 (noun) a pungent gas compounded of nitrogen and hydrogen (NH3). · · Noun Definition 2 Synonyms · · · ammonia water · · Synonym 1 ammonium hydroxide · · Synonym 2 Characters · · a latin small letter a U+0061 i latin small letter i U+0069 m latin small letter m U+006D n latin small letter n U+006E o latin small letter o U+006F