Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Language: French
Origin: Late Latin monoculus 'one-eyed', from Latin mono- ( MONO-) + oculus 'eye'

monocle

 noun
     
mon‧o‧cle [countable]
a round piece of glass that you put in front of one eye to help you see better
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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