exophthalmos
noun
ex·oph·thal·mos ˌek-säf-ˈthal-məs 
-səf-,
-säp-
variants or less commonly exophthalmus
: abnormal protrusion of the eyeball
exophthalmic
ˌek-säf-ˈthal-mik
adjective -səf-
-säp-
Example Sentences
Recent Examples on the Web Bulging or protruding eyes (proptosis or exophthalmos) can be a sign of Graves disease, a disorder causing overactivity of the thyroid gland (hyperthyroidism). 
Claire Gillespie, SELF, 19 Oct. 2017
Claire Gillespie, SELF, 19 Oct. 2017 Word History
Etymology
New Latin, from Greek exophthalmos having prominent eyes, from ex out + ophthalmos eye; akin to Greek ōps eye — more at eye
First Known Use
1872, in the meaning defined above
Medical Definition
exophthalmos
noun
ex·oph·thal·mos
variants also exophthalmus
ˌek-säf-ˈthal-məs, -səf-
: abnormal protrusion of the eyeball