millimeter

[mil-uh-mee-ter]
noun
a unit of length equal to one thousandth of a meter and equivalent to 0.03937 inch. Abbreviation: mm
Also, especially British, millimetre.


Origin:
1800–10; < French millimètre. See milli-, meter1

millimetric [mil-uh-me-trik] , adjective
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World English Dictionary
millimetre or (US) millimeter (ˈmɪlɪˌmiːtə)
 
n
mm one thousandth of a metre
 
millimeter or (US) millimeter
 
n

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

millimeter
1807, from Fr. millimetre; see milli- + meter.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

millimeter mil·li·me·ter (mĭl'ə-mē'tər)
n.

Abbr. mm A unit of length equal to one thousandth (10-3) of a meter (0.0394 inch).

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
millimeter   (mĭl'ə-mē'tər)  Pronunciation Key 
A unit of length in the metric system equal to 0.001 meter. See Table at measurement.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If you show someone a millimeter next to a meter, the difference is obvious and
  large.
The other ensconces itself in the micro-habitat of the sebaceous gland, less
  than a millimeter away.
Instead it's bits of plastic less than one millimeter in size.
But scientists believe that the rate of rise was essentially the same for
  several thousand years: about one millimeter per year.
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