Meaning of MICROMETER in English
Instrument for making precise linear measurements of dimensions such as diameters, thicknesses, and lengths of solid bodies.
It consists of a C-shaped frame with a movable jaw operated by a screw. The accuracy of the measurements depends on the accuracy of the screw-nut combination.
Britannica Concise Encyclopedia. Краткая энциклопедия Британика. 2012