Definition of exophthalmos in US English:


(also exophthalmus, exophthalmia)


  • Abnormal protrusion of the eyeball or eyeballs.

    • ‘The left orbit was medially compressed, and exophthalmos had occurred.’
    • ‘People with exophthalmos are able to look upwards without moving their eyebrows.’
    • ‘One you have been diagnosed, your eye doctor will want to examine your eyes regularly, because exophthalmos is a progressive disease.’
    • ‘Thyroid problems are by far the most common cause of exophthalmos.’
    • ‘The clinical features of thyroid eye disease include ocular pain, photophobia, chemosis, diplopia, exophthalmos, and eye irritation.’


Early 17th century: from modern Latin exophthalmus, from Greek exophthalmos ‘having prominent eyes’, from ex- ‘out’ + ophthalmos ‘eye’.