Noun micrometer has 2 senses
  1. micrometer, micrometer gauge, micrometer caliper - caliper for measuring small distances
    --1 is a kind of caliper, calipers, calliper, callipers
  2. micron, micrometer - a metric unit of length equal to one millionth of a meter
    --2 is a kind of metric linear unit
    --2 is a part of millimeter, millimetre, mm
    --2 has parts:
     nanometer, nanometre, nm, millimicron, micromillimeter, micromillimetre
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