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

  1. (US English)
    (British English micrometre)
    (symbol μm)
    a unit for measuring length, equal to one millionth of a metre
  2.  
    /maɪˈkrɒmɪtə(r)/
     
    /maɪˈkrɑːmɪtər/
     a device used for measuring very small distances or spaces
See micrometer in the Oxford Advanced American Dictionary
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