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Noun: micromillimeter  ,mI-krow'mi-lu,mee-tur
Usage: US (elsewhere: micromillimetre)
  1. A metric unit of length equal to one billionth of a meter
    - nanometer [US], nanometre [Brit, Cdn], nm, millimicron, micromillimetre [Brit, Cdn]

Derived forms: micromillimeters

Type of: metric linear unit

Part of: micrometer[2] [US], micrometre [Brit, Cdn], micron