Main Entry: eye·cup

Pronunciation: \ˈī-ˌkəp\

Function: noun

Date: circa 1874

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 (as binoculars) for keeping out extraneous light