Found 2 items, similar to millimicron.
English → English (WordNet) Definition: millimicron millimicron n : a metric unit of length equal to one billionth of a meter [syn: nanometer, nanometre, nm, micromillimeter, micromillimetre]
English → English (gcide) Definition: Millimicron Millimicron \Mil"li*mi`cron\, n. [Milli- + micron.] The thousandth part of a micron or the millionth part of a millimeter; -- a unit of length used in measuring light waves, etc. [Webster 1913 Suppl.]