eyecup
noun
eye·cup
| \ ˈī-ˌkəp
\
\
Definition of eyecup
1
: a small oval cup with a rim curved to fit the orbit of the eye used for applying liquid remedies to the eyes
2
: optic cup
3
: a usually rubber cup at the eyepiece of an optical instrument (such as binoculars) for keeping out extraneous light
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