Definition of mouthwash noun from the Oxford Advanced American Dictionary

 

mouthwash

 noun
noun
NAmE//ˈmaʊθwɑʃ//
 
, NAmE//ˈmaʊθwɔʃ//
 
[countable, uncountable]
 
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a liquid used to make the mouth fresh and healthy
See the Oxford Advanced Learner's Dictionary entry: mouthwash