Definition of "quizzing-glass" []

• A single eyeglass, or monocle; especially, one that is held to the eye by the muscles of the face. (noun)

The Century Dictionary (Public Domain)

• "Since he could not turn his head because of the height of his collar, Hugo turned from the waist, his quizzing-glass before his eye."
• "Once I dropped an emerald quizzing-glass down a drain because it had no value to me."
• "And is sporting a quizzing-glass made from a single flawless emerald — the sort of gem he could never have afforded to buy, even if he does have enough money for the senatorial census."