Micrometer
MICROM'ETER, noun [Gr. small, and measure.] An instrument for measuring small objects or spaces, by the help of which, the apparent magnitude of objects viewed through the microscope or telescope, is measured with great exactness.
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MICROM'ETER, noun [Gr. small, and measure.] An instrument for measuring small objects or spaces, by the help of which, the apparent magnitude of objects viewed through the microscope or telescope, is measured with great exactness.