- an instrument for measuring very small distances, angles, diameters, etc., used on a telescope or microscope
- micrometer caliper
Origin of micrometerFrench micromètre: see micro- and -meter
Brit. sp. mi′cro·me·tre
Origin of micrometermicro- (sense ) + meter (noun)
A device for measuring very small distances, objects, or angles, especially one based on the rotation of a finely threaded screw.
micro- +"Ž meter