ex·​oph·​thal·​mos | \ ˌek-säf-ˈthal-məs How to pronounce exophthalmos (audio) , -səf-, -säp- \
variants: or less commonly exophthalmus

Definition of exophthalmos

: abnormal protrusion of the eyeball

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Other Words from exophthalmos

exophthalmic \ ˌek-​säf-​ˈthal-​mik How to pronounce exophthalmic (audio) , -​səf-​ , -​säp-​ \ adjective

Examples of exophthalmos in a Sentence

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, "5 Reasons to Get Your Eyes Checked That Have Nothing to Do With Your Vision," 19 Oct. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'exophthalmos.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of exophthalmos

1872, in the meaning defined above

History and Etymology for exophthalmos

New Latin, from Greek exophthalmos having prominent eyes, from ex out + ophthalmos eye; akin to Greek ōps eye — more at eye

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Time Traveler for exophthalmos

Time Traveler

The first known use of exophthalmos was in 1872

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Cite this Entry

“Exophthalmos.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exophthalmos. Accessed 5 Jul. 2020.

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More Definitions for exophthalmos


variants: also exophthalmus \ ˌek-​säf-​ˈthal-​məs, -​səf-​ How to pronounce exophthalmus (audio) \

Medical Definition of exophthalmos

: abnormal protrusion of the eyeball

Other Words from exophthalmos

exophthalmic \ ˌek-​säf-​ˈthal-​mik How to pronounce exophthalmic (audio) \ adjective

More from Merriam-Webster on exophthalmos

Britannica.com: Encyclopedia article about exophthalmos

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