<p><strong>Noun</strong></p><ul><li>Any of various devices for measuring minute distances, angles, etc., as in connection with a telescope or microscope.</li><li>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.</li></ul><p><strong>Also Called</strong></p><ul><li>Mike</li><li>Micrometer</li></ul>