Definitions

from The Century Dictionary.

  • noun An instrument for measuring microscopic lengths and angles.

from the GNU version of the Collaborative International Dictionary of English.

  • noun 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.
  • noun 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.
  • noun 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 object glass, it is called a divided-object-glass micrometer, and when the instrument is large and equatorially mounted, it is known as a heliometer.
  • noun a species of double image micrometer, in which the two images are formed by the double refraction of rock crystal.
  • noun See under Bifilar.
  • noun (Mech.) a caliper or gauge with a micrometer screw, for measuring dimensions with great accuracy.
  • noun the head of a micrometer screw.
  • noun a compound microscope combined with a filar micrometer, used chiefly for reading and subdividing the divisions of large astronomical and geodetical instruments.
  • noun a screw with a graduated head used in some forms of micrometers; turning the head one full revolution advances the position of the tip of the screw only by a little.
  • noun See under Position.
  • noun a minute and very delicately graduated scale of equal parts used in the field of a telescope or microscope, for measuring distances by direct comparison.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A device used to measure distance very precisely but within a limited range, especially depth, thickness, and diameter.
  • noun An SI/MKS unit of measure, the length of one one-millionth of a meter. Symbols: µm, um, rm

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a metric unit of length equal to one millionth of a meter
  • noun caliper for measuring small distances

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From French micrometre

from Wiktionary, Creative Commons Attribution/Share-Alike License

micro- +‎ meter

Examples

  • In 2001 Japanese scientists made a tiny sculpture of a bull that measured 10 micrometers by seven (a micrometer is one-thousandth of a millimeter).

    June 2007

  • The word micrometer now seems to be used only to refer to the instrument for measurement, the former usage MIcrometer now being supplanted by the word micron.

    VERBATIM: The Language Quarterly Vol IV No 3

  • This is done by submitting exactly similar cylinders of lead to a crushing under weights acting without initial velocity, and measuring the reduced heights of the cylinders; from these results a table is constructed establishing empirical relations between the reduced heights and the corresponding weights; the cylinders are measured both before and after insertion in the pressure gauge by means of an instrument known as the micrometer calipers (Fig. 57). [

    Nitro-Explosives: A Practical Treatise

  • Imagine it: a flower blossoming inside the brain, nanometer stalks splitting away from a micrometer stem.

    World Wide Mind

  • A cross-section of a capillary, showing how much room a nanowire the gray-shaded circle would take up within it. “1 µm” means “1 micrometer,” or one millionth of a meter.

    World Wide Mind

  • They are trying to measure with a micrometer, mark with a dull pencil, and cut with a chain saw.

    Coyote Blog » Blog Archive » Example of Climate Work That Needs to be Checked and Replicated

  • While you don't necessarily need a micrometer to calibrate a leader to your line, you ought to consider holding loops of the same size of the butt section of the leader you intend to use and the end section of your fly line next to each other for comparison.

    How to Choose Leaders and Tippets when Fly Fishing

  • A cross-section of a capillary, showing how much room a nanowire the gray-shaded circle would take up within it. “1 µm” means “1 micrometer,” or one millionth of a meter.

    World Wide Mind

  • While you don't necessarily need a micrometer to calibrate a leader to your line, you ought to consider holding loops of the same size of the butt section of the leader you intend to use and the end section of your fly line next to each other for comparison.

    How to Choose Leaders and Tippets when Fly Fishing

  • Imagine it: a flower blossoming inside the brain, nanometer stalks splitting away from a micrometer stem.

    World Wide Mind

Comments

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  • Also a device used to measure parts.

    September 23, 2008