micrometer

noun (1)
mi·crom·e·ter | \mī-ˈkrä-mə-tər \

Definition of micrometer 

(Entry 1 of 2)

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

micrometer

noun (2)
mi·cro·me·ter | \ˈmī-krō-ˌmē-tər \

Definition of micrometer (Entry 2 of 2)

: a unit of length equal to one millionth of a meter

called also micron

— see Metric System Table

Illustration of micrometer

Illustration of micrometer

Noun (1)

micrometer 2

In the meaning defined above

First Known Use of micrometer

Noun (1)

1670, in the meaning defined at sense 1

Noun (2)

1880, in the meaning defined above

History and Etymology for micrometer

Noun (1)

French micromètre, from micr- + -mètre -meter

Noun (2)

International Scientific Vocabulary micr- + meter entry 3

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The first known use of micrometer was in 1670

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More Definitions for micrometer

micrometer

noun
mi·crom·e·ter | \mī-ˈkrä-mə-tər \

Kids Definition of micrometer

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

micrometer

noun
mi·crom·e·ter | \mī-ˈkräm-ət-ər \

Medical Definition of micrometer 

(Entry 1 of 2)

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

micrometer

noun
mi·cro·me·ter
variants: or chiefly British micrometre \ˈmī-krō-ˌmēt-ər \

Medical Definition of micrometer (Entry 2 of 2)

: micron

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