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1. (n.) micrometer
any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope.
Etymology: (1660–70)
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| Definition of 'micrometer' |
Princeton's WordNet |
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1. (noun) micron, micrometer
a metric unit of length equal to one millionth of a meter
2. (noun) micrometer, micrometer gauge, micrometer caliper
caliper for measuring small distances
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| Definition of 'micrometer' |
Webster Dictionary |
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1. (noun) micrometer
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
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| Definition of 'micrometer' |
The Standard Electrical Dictionary |
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1. micrometer
An instrument for measuring small distances or small differences. It generally is based upon an accurate screw which may have a worm wheel for head, actuated by a worm or helix with graduated head, so that exceedingly small advances of the screw may be produced. The pitch of the screw being known its actual advance is known.
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Definitions of micrometer 
