micrometer
noun
- an instrument for measuring very small distances, angles, diameters, etc., used on a telescope or microscope
- micrometer caliper
See micrometer in American Heritage Dictionary 4
(mī-krŏmˈĭ-tər)
noun A device for measuring very small distances, objects, or angles, especially one based on the rotation of a finely threaded screw, as in relation to a microscope.
(mīˈkrō-mēˌtər)
noun A unit of length equal to one thousandth (10-3) of a millimeter or one millionth (10-6)of a meter.
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