ex·​oph·​thal·​mos ˌek-säf-ˈthal-məs How to pronounce exophthalmos (audio)
variants or less commonly exophthalmus
: abnormal protrusion of the eyeball
ˌek-säf-ˈthal-mik How to pronounce exophthalmos (audio)

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, 19 Oct. 2017

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'exophthalmos.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


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

Time Traveler
The first known use of exophthalmos was in 1872

Dictionary Entries Near exophthalmos

Cite this Entry

“Exophthalmos.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/exophthalmos. Accessed 13 Apr. 2024.

Medical Definition


variants also exophthalmus
: abnormal protrusion of the eyeball
exophthalmic adjective

More from Merriam-Webster on exophthalmos

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