Meaning of MICROMETER in English

MICROMETER

( 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.

Webster's Revised Unabridged English Dictionary.      Пересмотренный полный словарь английского языка Webster.