The Collaborative International Dictionary of English v.0.48:

Exophthalmia \Ex`oph*thal"mi*a\, n. [Nl.,fr. Gr. ? with
   prominent eyes; ? out + ? the eye.] (Med.)
   The protrusion of the eyeball so that the eyelids will not
   cover it, in consequence of disease.
   [1913 Webster]