Definition of dioptric adjective from the Oxford Advanced Learner's Dictionary

 

dioptric

 adjective
adjective
BrE BrE//daɪˈɒptrɪk//
 
; NAmE NAmE//daɪˈɑːptrɪk//
 
(physics)
 
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connected with the scientific study of refraction (= the way light changes direction when it goes through glass, etc.)