- micrometer, micrometer gauge, micrometer caliper - caliper for measuring small distances
--1 is a kind of caliper, calipers, calliper, callipers
- 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