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micrometer (n.)

1660s, from micro- + -meter. Originally a telescope attachment for measuring small angular distances; from 1884 as a craftsman's tool for extreme accuracy in fine measurements. Related: Micrometry; micrometric.

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Definitions of micrometer from WordNet

micrometer (n.)
a metric unit of length equal to one millionth of a meter;
Synonyms: micron
micrometer (n.)
caliper for measuring small distances;
Synonyms: micrometer gauge / micrometer caliper
From wordnet.princeton.edu