English definition of Micrometer

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Definition of micrometer

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Micrometer (n.) 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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Filar :: Filar (a.) Of or pertaining to a thread or line; characterized by threads stretched across the field of view; as, a filar microscope; a filar micrometer..

Sector :: Sector (n.) An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. When it is used for measuring zenith distances of stars, it is called a zenith sector..

Micrometer :: Micrometer (n.) 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..

Comb :: Comb (n.) The notched scale of a wire micrometer.

Micrometrical :: Micrometrical (a.) Belonging to micrometry; made by the micrometer.

Telemeter :: Telemeter (n.) An instrument used for measuring the distance of an object from an observer; as, a telescope with a micrometer for measuring the apparent diameter of an object whose real dimensions are known..

Micr- :: Micr- () A millionth part of; as, microfarad, microohm, micrometer..

Micrometry :: Micrometry (n.) The art of measuring with a micrometer.

Dynameter :: Dynameter (n.) An instrument for determining the magnifying power of telescopes, consisting usually of a doubleimage micrometer applied to the eye end of a telescope for measuring accurately the diameter of the image of the object glass there formed; which measurement, compared with the actual diameter of the glass, gives the magnifying power..

Megameter :: Megameter (n.) A micrometer.

Radiomicrometer :: Radiomicrometer (n.) A very sensitive modification or application of the thermopile, used for indicating minute changes of radiant heat, or temperature..