eyepiece
eye·piece
noun \ˈī-ˌpēs\Definition of EYEPIECE
: the lens or combination of lenses at the eye end of an optical instrument—called also ocular
Illustration of EYEPIECE
Learn More About
Seen & Heard 
What made you want to look up eyepiece? Please tell us where you read or heard it (including the quote, if possible).
