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Definition of Micrometer
1. Noun. A metric unit of length equal to one millionth of a meter.
Generic synonyms: Metric Linear Unit
Terms within: Micromillimeter, Micromillimetre, Millimicron, Nanometer, Nanometre, Nm
Group relationships: Millimeter, Millimetre, Mm
2. Noun. Caliper for measuring small distances.
Definition of Micrometer
1. 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.
Definition of Micrometer
1. Noun. An SI/MKS unit of measure, the length of one one-millionth of a meter. Symbols: µm, um, rm ¹
2. Noun. A device used to measure distance very precisely but within a limited range, especially depth, thickness, and diameter. ¹
¹ Source: wiktionary.com
Definition of Micrometer
1. [n -S]
Medical Definition of Micrometer
1.
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. Circular, or Ring, micrometer, a metallic ring fixed in the focus of the object glass of a telescope, and used to determine differences of right ascension and declination between stars by observations of the times at which the stars cross the inner or outer periphery of the ring. Double image micrometer, a micrometer in which two images of an object are formed in the field, usually by the two halves of a bisected lens which are movable along their line of section by a screw, and distances are determined by the number of screw revolutions necessary to bring the points to be measured into optical coincidence. When the two images are formed by a bisected objects glass, it is called a divided-object-glass micrometer, and when the instrument is large and equatorially mounted, it is known as a heliometer. Double refraction micrometer, a species of double image micrometer, in which the two images are formed by the double refraction of rock crystal. Filar, or Bifilar, micrometer. See Bifilar.