noun
: a microscope provided with cross hairs and mounted in such a way that it can be moved along a base with a screw for the purpose of making accurate measurements of distance
noun
: a microscope provided with cross hairs and mounted in such a way that it can be moved along a base with a screw for the purpose of making accurate measurements of distance
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012