Pronunciation: (mī-krom'i-tur),[key] —n. 1. any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope.
2. Also called mike, microm'eter cal'iper. a precision instrument with a spindle moved by a finely threaded screw, for the measurement of thicknesses and short lengths, commonly used by machinists for turning shafts or boring holes. Also,esp. Brit.,mi•crom'e•tre.