noun, plural millimicrons, millimicra [mil-uh-mahy-kruh] .
a unit of length equal to one thousandth of a micron; one-billionth of a meter. Symbol:
Compare nanometer.

1900–05; milli- + micron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
millimicron (ˈmɪlɪˌmaɪkrɒn)
an obsolete name for a nanometre; one millionth of a millimetre

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American Heritage
Medical Dictionary

millimicron mil·li·mi·cron (mĭl'ə-mī'krŏn)

Abbr. A unit of length that is equal to one thousandth (10-3) of a micrometer or one billionth (10-9) of a meter; nanometer.

The American Heritage® Stedman's Medical Dictionary
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