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1

micrometer

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noun mi·crom·e·ter \mī-ˈkrä-mə-tər\

Definition of micrometer

  1. 1 :  an instrument used with a telescope or microscope for measuring minute distances

  2. 2 :  a caliper for making precise measurements that has a spindle moved by a finely threaded screw



Illustration of micrometer

Origin of micrometer

French micromètre, from micr- + -mètre -meter


First Known Use: 1670


2

micrometer

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noun mi·cro·me·ter \ˈmī-krō-ˌmē-tər\

Definition of micrometer

  1. :  a unit of length equal to one millionth of a meter —called also micron — see metric system table



Origin of micrometer

International Scientific Vocabulary micr- + 3meter


First Known Use: 1880



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