Dictionary

1micrometer

noun mi·crom·e·ter \mī-ˈkrä-mə-tər\

Definition of MICROMETER

1
:  an instrument used with a telescope or microscope for measuring minute distances
2
:  a caliper for making precise measurements that has a spindle moved by a finely threaded screw
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Illustration of MICROMETER

Origin of MICROMETER

French micromètre, from micr- + -mètre -meter
First Known Use: 1670

2micrometer

noun mi·cro·me·ter \ˈmī-krō-ˌmē-tər\

Definition of MICROMETER

:  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
MICROMETER Defined for Kids

micrometer

noun mi·crom·e·ter \mī-ˈkrä-mə-tər\

Definition of MICROMETER for Kids

1
:  an instrument used with a telescope or microscope for measuring very small distances
2
:  an instrument having a rod moved by fine screw threads and used for making exact measurements

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