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

 

eyepiece

 noun
noun
BrE BrE//ˈaɪpiːs//
 
; NAmE NAmE//ˈaɪpiːs//
 
 
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the piece of glass (= a lens) at the end of a telescope or microscope that you look through
See the Oxford Advanced American Dictionary entry: eyepiece