Quick definitions from WordNet (eyebath)
▸ noun: a small vessel with a rim curved to fit the orbit of the eye; use to apply medicated or cleansing solution to the eyeball ("An eyecup is called an eyebath in Britain")
▸ noun: a small vessel with a rim curved to fit the orbit of the eye; use to apply medicated or cleansing solution to the eyeball ("An eyecup is called an eyebath in Britain")