English

Definition of ammonium noun from the Oxford Advanced Learner's Dictionary

 

ammonium

 noun
noun
BrE BrE//əˈməʊniəm//
 
; NAmE NAmE//əˈmoʊniəm//
 
[uncountable] (chemistry)
 
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an ion (1) made from ammonia containing nitrogen and hydrogen together with another element Word Origin early 19th cent.: from ammonia + -ium.
See the Oxford Advanced American Dictionary entry: ammonium