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millimicron

[mil-uh-mahy-kron]
noun, plural mil·li·mi·crons, mil·li·mi·cra [mil-uh-mahy-kruh] /ˈmɪl əˌmaɪ krə/.
  1. a unit of length equal to one thousandth of a micron; one-billionth of a meter. Symbol: mμ
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Compare nanometer.

Origin of millimicron

First recorded in 1900–05; milli- + micron
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for millimicron

millimicron

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

millimicron in Medicine

millimicron

(mĭlə-mī′krŏn)
n.
  1. A unit of length that is equal to one thousandth (10-3) of a micrometer or one billionth (10-9) of a meter; nanometer.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.