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Definition of eyeglass : 1. A glass eyecup. See Eyecup.
2. A lens of glass to assist the sight. Eyeglasses are used singly or in pairs.
3. Eyepiece of a telescope, microscope, etc.
4. The retina.

Synonyms:

monocle

field glasses, magnifying glass, camera, optical instrument, periscope, microscope, eyepiece, magnifier, prism, concave lens, lens, mirror, pince-nez, convex lens, ocular, telescope, condenser, binocular, lorgnette

Usage examples:

• The Englishman is thin and tall; He screws an eyeglass in his face, And talks with a reluctant drawl. - "Verse and Worse", Harry Graham.
• He actually removed his eyeglass. - "Kent Knowles: Quahaug", Joseph C. Lincoln.
• " In that case," asked Mr. Carrington, still in his easy voice, but with a quick turn of his eyeglass towards the lawyer, " why was no outside assistance called in at once?" - "Simon", J. Storer Clouston.