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

 

stopwatch

 noun
noun
BrE BrE//ˈstɒpwɒtʃ//
 
; NAmE NAmE//ˈstɑːpwɑːtʃ//
 
Athletics
 
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a watch that you can stop and start by pressing buttons, in order to time a race, etc. accurately See related entries: Athletics
See the Oxford Advanced American Dictionary entry: stopwatch