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millimeter

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

Origin of millimeter

From the French word millimètre, dating back to 1800–10. See milli-, meter1
Related formsmil·li·met·ric [mil-uh-me-trik] /ˌmɪl əˈmɛ trɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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Word Origin and History for millimeter

n.

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

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Online Etymology Dictionary, © 2010 Douglas Harper

millimeter in Medicine

millimeter

(mĭlə-mē′tər)
n.
  1. A unit of length equal to one thousandth (10-3) of a meter (0.0394 inch).
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

millimeter in Science

millimeter

[mĭlə-mē′tər]
  1. A unit of length in the metric system equal to 0.001 meter. See Table at measurement.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.