micrometer

1 [mahy-krom-i-ter]
noun
1.
any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope.
2.
Also called mike, micrometer caliper. a precision instrument with a spindle moved by a finely threaded screw, for the measurement of thicknesses and short lengths, commonly used by machinists for turning shafts or boring holes.
Also, especially British, micrometre.


Origin:
1660–70; micro- + -meter

Dictionary.com Unabridged

micrometer

2 [mahy-kroh-mee-ter]
noun
micron ( def 1 ).

Origin:
micro- + meter1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
micrometer (maɪˈkrɒmɪtə)
 
n
1.  any of various instruments or devices for the accurate measurement of distances or angles
2.  micrometer gauge, Also called: micrometer calliper a type of gauge for the accurate measurement of small distances, thicknesses, diameters, etc. The gap between its measuring faces is adjusted by a fine screw, the rotation of the screw giving a sensitive measure of the distance moved by the face
 
mi'crometry
 
n
 
micrometric
 
adj
 
micro'metrical
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

micrometer
1670, from micro- + Gk. metron "measure" (see meter (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

micrometer mi·crom·e·ter1 (mī-krŏm'ĭ-tər)
n.
A device for measuring very small distances, objects, or angles, especially one based on the rotation of a finely threaded screw, as in relation to a microscope.

micrometer mi·cro·me·ter2 (mī'krō-mē'tər)
n.

Abbr. μm A unit of length equal to one thousandth (10-3) of a millimeter or one millionth (10-6) of a meter. Also called micron.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
micrometer 1   (mī-krŏm'ĭ-tər)  Pronunciation Key 
A device for measuring very small distances, angles, or objects, especially one based on the rotation of a finely threaded screw, as in relation to a microscope.
micrometer 2   (mī'krō-mē'tər)  Pronunciation Key 
A unit of length in the metric system equal to one millionth (10-6) of a meter. Also called micron.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The second is the measurement of the weathering of marble and other
  gravestones, which requires a micrometer.
The one on the left is one-tenth of a micrometer thick and is made of a porous
  support with a thin coating of the membrane.
Existing methods to make gratings with lines that are less than a micrometer
  apart are complicated and expensive.
They start by etching grooves into the substrate, leaving a series of thin
  sapphire ridges, each about one micrometer wide.
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