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millimicron

American  
[mil-uh-mahy-kron] / ˈmɪl əˌmaɪ krɒn /

noun

PLURAL

millimicrons, millimicra

  1. a unit of length equal to one thousandth of a micron; one-billionth of a meter. mμ

millimicron British  
/ ˈmɪlɪˌmaɪkrɒn /

noun

  1. an obsolete name for a nanometre; one millionth of a millimetre

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of millimicron

First recorded in 1900–05; milli- + micron

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.