- a unit of length equal to one thousandth of a meter and equivalent to 0.03937 inch. Abbreviation: mm
Also especially British, mil·li·me·tre.
Origin of millimeter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for millimetre
This machine forged forty millimetre rivets with the calm ease of a giant.L'Assommoir
It is about the ten-millionth of a millimetre, and a millimetre is about the 1/25 of an inch!The Outline of Science, Vol. 1 (of 4)
J. Arthur Thomson
The young larva measures a millimetre and a half2 in length.The Glow-Worm and Other Beetles
Jean Henri Fabre
I place on the surface of the honey five or six bits of straw a millimetre in length.The Mason-bees
J. Henri Fabre
In practice, wave-lengths are expressed in ten-millionths of a millimetre.Curiosities of Light and Sight
- one thousandth of a metreSymbol: mm
Word Origin and History for millimetre
Online Etymology Dictionary, © 2010 Douglas Harper
- A unit of length equal to one thousandth (10-3) of a meter (0.0394 inch).
- A unit of length in the metric system equal to 0.001 meter. See Table at measurement.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.