Definition of proptosis in English:

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Pronunciation: /ˌpräpˈtōsəs/


Abnormal protrusion or displacement of an eye or other body part.
Example sentences
  • Signs of orbital injury include periorbital ecchymosis, edema, proptosis, and bony step-offs of the orbital rim.
  • The skull is a frequent site of bone metastases, which commonly present as proptosis and periorbital ecchymoses.
  • A 35-year-old man presented with symptoms of decreased visual acuity, proptosis, and ptosis of the left eye that had lasted for 2 weeks.


Late 17th century: via late Latin from Greek proptōsis, from pro 'before' + piptein 'to fall'.

For editors and proofreaders

Syllabification: prop·to·sis

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