Definition of micrometer noun from the Oxford Advanced American Dictionary

     

    micrometer

     noun
    (micrometre)noun
    NAmE//maɪˈkrɑmət̮ər//
     
     
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  1. 1 (symbol µm) a unit for measuring length, equal to one millionth of a meter
  2. 2a device used for measuring very small distances or spaces, using a screw with a very fine thread
See the Oxford Advanced Learner's Dictionary entry: micrometer