Definition of bifocals noun from the Oxford Advanced American Dictionary

 

bifocals

 noun
noun
NAmE//ˈbaɪˌfoʊklz//
 
[plural]
 
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a pair of glasses with each lens made in two parts. The upper part is for looking at things at a distance, and the lower part is for looking at things that are close to you. He peered through his bifocals. compare varifocals
 
adjective bifocal lenses
See the Oxford Advanced Learner's Dictionary entry: bifocals