The Collaborative International Dictionary of English v.0.48:
Exophthalmos \Ex`oph*thal"mos\, Exophthalmus \Ex`oph*thal"mus\, n. [NL.] (Med.) Same as Exophthalmia. Syn: exophthalmus, exophthalmy. [1913 Webster]WordNet (r) 3.0 (2006):
exophthalmos n 1: protrusion of the eyeball from the socket