micrometer

UK: /maɪˈkrɒmɪtə^r/

US: /maɪˈkrɑmɪtɚ/

US: (mī krom′i tər for 1; mī′krō mē′tər for 2)

WordReference Random House Learner's Dictionary of American English © 2025

mi•crom•e•ter¹ /maɪˈkrɑmɪtɚ/   n. [countable]

1. Weights and Measures any of various devices for measuring very small distances, angles, etc.

See -meter-.
mi•cro•met•er /ˈmaɪkroʊˌmitɚ/  n. [countable]

1. a micron.

WordReference Random House Unabridged Dictionary of American English © 2025

mi•crom•e•ter¹  (mī krom′i tər), n. 

1. Weights and Measures any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope.
2. Weights and Measures 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. 

• micro- + -meter 1660–70

mi•cro•me•ter²  (mī′krō mē′tər), n. 

1. Weights and Measures micron (def. 1).

• micro- + meter¹

Collins Concise English Dictionary © HarperCollins Publishers::

micrometer / maɪˈkrɒmɪtə/ noun

1. any of various instruments or devices for the accurate measurement of distances or angles
2. Also called: micrometer gauge, micrometer calliper a type of gauge for the accurate measurement of small distances, thicknesses, diameters, etc. The gap between its measuring faces is adjusted by a fine screw, the rotation of the screw giving a sensitive measure of the distance moved by the face

miˈcrometry noun

micrometric / ˌmaɪkrəʊˈmɛtrɪk/, ˌmicroˈmetrical adjective