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

 

micrometre

 noun
(especially US English micrometer)noun
BrE BrE//ˈmaɪkrəʊmiːtə(r)//
 
; NAmE NAmE//ˈmaɪkroʊmiːtər//
 
(symbol μm)
 
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a unit for measuring length, equal to one millionth of a metre