Dictionary

ammonium

noun am·mo·ni·um \ə-ˈmō-nē-əm\

Definition of AMMONIUM

:  an ion NH4+ derived from ammonia by combination with a hydrogen ion and known in compounds (as salts) that resemble in properties the compounds of the alkali metals
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Origin of AMMONIUM

New Latin, from ammonia
First Known Use: 1808

Ammonium

geographical name

Definition of AMMONIUM

— see siwa
Medical Dictionary

ammonium

noun am·mo·ni·um \ə-ˈmō-nē-əm\

Medical Definition of AMMONIUM

:  an ion NH4+ derived from ammonia by combination with a hydrogen ion and known in organic compounds (as quaternary ammonium compounds) and in compounds (as salts) that resemble in properties the compounds of the alkali metals
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