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micron

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mi⋅cron

  [mahy-kron]
–noun, plural -crons, -cra  [-kruh] .
1. Also called micrometer. the millionth part of a meter. Symbol: μ, mu
2. Physical Chemistry. a colloidal particle whose diameter is between 0.2 and 10 microns.
3. Physics. a very small unit of pressure, equal to that exerted by a column of mercury 1μ high.
Use micron in a Sentence
Also, mikron.

Origin:
1880–85; < Gk mīkrón a little, n. use of neut. sing. of mīkrós small; see -on 1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2010.
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mi·cron also mi·kron   (mī'krŏn')   
n.   pl. mi·crons or mi·cra (-krə) also mi·krons or mi·kra (-krə)
A unit of length equal to one millionth (10-6) of a meter. No longer in technical use.

[From Greek mīkron, neuter of mīkros, small.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

micron 
"one millionth of a meter," 1892, coined 1880 in Fr. from Gk. mikron, neut. of mikros "small."
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: mi·cron
Pronunciation: 'mI-"krän
Function: noun
: MICROMETER
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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micron mi·cron or mi·kron (mī'krŏn')
n. pl. mi·crons or mi·cra (-krə) or mi·krons or mi·kra (-krə)

Abbr. μm See micrometer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Science Dictionary
micron   (mī'krŏn')  Pronunciation Key 
See micrometer2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

Micron
Micron Electronics, Inc.

micron
micrometre

The Free On-line Dictionary of Computing, © 1993-2007 Denis Howe
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Encyclopedia

micron

metric unit of measure for length equal to 0.00l mm, or about 0.000039 inch. Its symbol is mum. The micrometre is commonly employed to measure the thickness or diameter of microscopic objects, such as microorganisms and colloidal particles. Minute distances, as, for example, the wavelengths of infrared radiation, are also given in micrometres.

Learn more about micron with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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