Try Our Apps


90s Slang You Should Know


[mil-uh-mee-ter] /ˈmɪl əˌmi tər/
a unit of length equal to one thousandth of a meter and equivalent to 0.03937 inch.
Abbreviation: mm.
Also, especially British, millimetre.
Origin of millimeter
From the French word millimètre, dating back to 1800-10. See milli-, meter1
Related forms
[mil-uh-me-trik] /ˌmɪl əˈmɛ trɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
Examples from the Web for millimeter
Contemporary Examples
Historical Examples
  • This unit is the one-thousandth part of a millimeter and is called the micro-millimeter or micron.

    The Fundamentals of Bacteriology Charles Bradfield Morrey
  • Conversely, if we slip a millimeter, Phelps will clip us so hard that the sky will ring.

    Highways in Hiding George Oliver Smith
  • A mil-ampere is a thousandth of an ampere just as a millimeter is a thousandth of a meter.

  • It is a tiny worm about a millimeter long and almost as slender as a hair.

    The Life of the Fly J. Henri Fabre
  • In this a zinc sulphide screen is fitted at the end of a short brass tube, with a speck of radium about a millimeter away from it.

    The Life Radiant Lilian Whiting
Word Origin and History for millimeter

also millimetre, 1802, from French millimetre; see milli- + meter (n.2).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
millimeter in Medicine

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

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.
Cite This Source
millimeter in Science
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.
Cite This Source

Word of the Day

Difficulty index for millimeter

Few English speakers likely know this word

Word Value for millimeter

Scrabble Words With Friends

Nearby words for millimeter