exophthalmos
Concise Oxford English Dictionary © 2008 Oxford University Press:
exophthalmos /ˌɛksɒfˈθalmɒs/
▶noun Medicine abnormal protrusion of the eyeball or eyeballs.
– derivatives
exophthalmic adjective.
exophthalmic adjective.
– origin C17: from mod. L. exophthalmus, from Gk exophthalmos ‘having prominent eyes’.
'exophthalmos' also found in these Oxford entries:

