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

 

chronometer

 noun
noun
BrE BrE//krəˈnɒmɪtə(r)//
 
; NAmE NAmE//krəˈnɑːmɪtər//
 
 
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a very accurate clock, especially one used at sea
See the Oxford Advanced American Dictionary entry: chronometer