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

 

mouser

 noun
noun
BrE BrE//ˈmaʊsə(r)//
 
; NAmE NAmE//ˈmaʊsər//
 
Domesticated mammals
 
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a cat that catches mice See related entries: Domesticated mammals
See the Oxford Advanced American Dictionary entry: mouser