micra

micra

[mahy-kruh]
noun
a plural of micron.
Dictionary.com Unabridged

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
micra (ˈmaɪkrə)
 
n
a plural of micron

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
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American Heritage
Science Dictionary
micron   (mī'krŏn')  Pronunciation Key 
See micrometer2.
The American Heritage® Science Dictionary
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