- A small oval porcelain or glass cup, having a rim curved to
fit the orbit of the eye. it is used in the application of liquid
remedies to eyes; -- called also eyeglass.
Meaning of 'eyecup' (Princeton's WordNet)
1 . eyecup
[ n]
Meaning (1): - a small vessel with a rim curved to fit the orbit of the eye; use to apply medicated or cleansing solution to the eyeball