Definition of monocle noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈmɒnəkl//
; NAmE NAmE//ˈmɑːnəkl//
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a single glass lens for one eye, held in place by the muscles around the eye and used by people in the past to help them see clearly Word Originmid 19th cent.: from French (earlier in the sense ‘one-eyed’), from late Latin monoculus ‘one-eyed’.
See the Oxford Advanced American Dictionary entry: monocle