from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Forward displacement of an organ, especially an eyeball.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. exophthalmos
from The Century Dictionary and Cyclopedia
- n. Prolapse or protrusion, as of the eyeball.
Late Latin proptōsis, prolapse, from Greek, from propiptein, proptō-, to fall forward : pro-, forward; see pro-2 + piptein, to fall; see pet- in Indo-European roots.(American Heritage® Dictionary of the English Language, Fourth Edition)