millimicron

[ mil-uh-mahy-kron ]

noun

, plural mil·li·mi·crons, mil·li·mi·cra [mil, -, uh, -mahy-kr, uh].

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

millimicron

/ ˈmɪlɪˌmaɪkrɒn /

noun

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

Word History and Origins

Origin of millimicron¹

First recorded in 1900–05; milli- + micron