[ek-sof-thal-muhs, -mos]
noun Pathology.
protrusion of the eyeball from the orbit, caused by disease, especially hyperthyroidism, or injury.
Also, exophthalmus [ek-sof-thal-muhs] , exophthalmia [ek-sof-thal-mee-uh] .

1870–75; < Neo-Latin < Greek exóphthalmos with prominent eyes, equivalent to ex- ex-3 + ophthalmós eye; see ophthalmic

exophthalmic, adjective
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World English Dictionary
exophthalmos, exophthalmus or exophthalmia (ˌɛksɒfˈθælmɒs, ˌɛksɒfˈθælməs, ˌɛksɒfˈθælmɪə)
proptosis, Also called: ocular proptosis abnormal protrusion of the eyeball, as caused by hyperthyroidism
[C19: via New Latin from Greek, from ex-1 + ophthalmos eye]
exophthalmus, exophthalmus or exophthalmia
[C19: via New Latin from Greek, from ex-1 + ophthalmos eye]
exophthalmia, exophthalmus or exophthalmia
[C19: via New Latin from Greek, from ex-1 + ophthalmos eye]
exoph'thalmic, exophthalmus or exophthalmia

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

exophthalmos ex·oph·thal·mos (ěk'səf-thāl'məs)
Abnormal protrusion of the eyeball.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Encyclopedia Britannica


abnormal protrusion of one or both eyeballs. The most common cause for unilateral or bilateral exophthalmos is thyroid eye disease, or Graves ophthalmopathy. The proptosis arises from inflammation, cellular proliferation, and accumulation of fluid in the tissues that surround the eyeball in its socket, or orbit. The vast majority of people with Graves ophthalmopathy also have (or will later develop) thyroid dysfunction. Other causes of exophthalmos include other orbital inflammatory conditions, spread of infection from the paranasal sinuses or teeth, trauma, various orbital tumours, and vascular (blood vessel) abnormalities of the orbit. It should also be noted that "prominent" eyes can be a normal inherited trait in certain families

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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