Noun micromillimeter has 1 sense
  1. nanometer, nanometre, nm, millimicron, micromillimeter, micromillimetre - a metric unit of length equal to one billionth of a meter
    --1 is a kind of metric linear unit
    --1 is a part of micron, micrometer
    --1 has parts: angstrom, angstrom unit, A
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