microscope

n. [ Micro- + -scope. ] An optical instrument, consisting of a lens, or combination of lenses, for making an enlarged image of an object which is too minute to be viewed by the naked eye. [ 1913 Webster ]

Compound microscope, an instrument consisting of a combination of lenses such that the image formed by the lens or set of lenses nearest the object (called the objective) is magnified by another lens called the ocular or eyepiece. --
Oxyhydrogen microscope, and
Solar microscope. See under Oxyhydrogen, and Solar. --
Simple microscope, or
Single microscope, a single convex lens used to magnify objects placed in its focus. [ 1913 Webster ]