Bible Dictionaries
Micrometer
Webster's Dictionary
(n.) An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass.
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Bibliography Information
Webster, Noah. Entry for 'Micrometer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/m/micrometer.html. 1828.