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

 

ammonia

 noun
noun
BrE BrE//əˈməʊniə//
 
; NAmE NAmE//əˈmoʊniə//
 
[uncountable](symbol NH3)
 
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a gas with a strong smell; a clear liquid containing ammonia, used as a cleaning substance Word Origin late 18th cent.: modern Latin, from sal ammoniacus, ‘salt of Ammon’. This came from the Greek word ammōniakos ‘of Ammon’, used as a name for the salt and gum obtained near the temple of Jupiter Ammon at Siwa in Egypt.
See the Oxford Advanced American Dictionary entry: ammonia