follow Dictionary.com

Get the details behind our redesign

proptosis

[prop-toh-sis] /prɒpˈtoʊ sɪs/
noun, Pathology
1.
the forward displacement of an organ.
Origin
1670-1680
1670-80; < Neo-Latin < Greek próptōsis a fall forward. See pro-2, ptosis
Related forms
proptosed
[prop-tohst] /ˈprɒp toʊst/ (Show IPA),
proptotic
[prop-tot-ik] /prɒpˈtɒt ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for proptosis

proptosis

/prɒpˈtəʊsɪs/
noun (pl) -ses (-siːz)
1.
(pathol) the forward displacement of an organ or part, such as the eyeball See also exophthalmos Compare prolapse
Word Origin
C17: via Late Latin from Greek, from propiptein to fall forwards
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
proptosis in Medicine

proptosis prop·to·sis (prŏp-tō'sĭs)
n. pl. prop·to·ses (-sēz)
Forward displacement of an organ, especially an eyeball.


prop·tot·ic (-tŏt'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
Encyclopedia Article for proptosis

exophthalmos

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

Learn more about exophthalmos with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
Cite This Source

Word of The Day

Difficulty index for proptosis

Few English speakers likely know this word

Word Value for proptosis

13
0
Scrabble Words With Friends