micron

[mahy-kron]
noun, plural microns, micra [mahy-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.
Also, mikron.


Origin:
1880–85; < Greek mīkrón a little, noun use of neuter singular of mīkrós small; see -on1

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World English Dictionary
micron (ˈmaɪkrɒn)
 
n , pl -crons, -cra
a unit of length equal to 10--6 metre. It is being replaced by the micrometre, the equivalent SI unit
 
[C19: New Latin, from Greek mikros small]

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

micron
"one millionth of a meter," 1892, coined 1880 in Fr. from Gk. mikron, neut. of mikros "small."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
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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FOLDOC
Computing Dictionary

Micron definition


Micron Electronics, Inc.

micron definition


micrometre

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Encyclopedia Britannica
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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
But the micron-sized particles from the volcano's mouth did not fall back at all.
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