Source : Webster's Revised Unabridged Dictionary (1913)

Eyecup \Eye"cup`\, n.
   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}.

Source : WordNet®

eyecup
     n 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; "an eyecup is called an eyebath in Britain"
          [syn: {eyebath}, {eye cup}]
     2: (embryology) a two-walled cuplike depression that develops
        into the pigmented and sensory layers of the retina [syn:
        {optic cup}]