Definition of stopwatch noun from the Oxford Advanced American Dictionary

 

stopwatch

 noun
noun
NAmE//ˈstɑpwɑtʃ//
 
, NAmE//ˈstɑpwɔtʃ//
 
 
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a watch that you can stop and start by pressing buttons, in order to time a race, etc. accurately
See the Oxford Advanced Learner's Dictionary entry: stopwatch