micrometer Meaning, Definition & Usage
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noun a metric unit of length equal to one millionth of a meter
micron.
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noun caliper for measuring small distances
micrometer caliper; micrometer gauge.
WordNet
Mi*crom"e*ter noun
Etymology
Definitions
An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass.