Definition of proptosis

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< prop root

propulsion >

prop·to·sis    (prp-tss) KEY 

NOUN:
pl. prop·to·ses  (-sz) KEY 

Forward displacement of an organ, especially an eyeball.

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ETYMOLOGY:
Late Latin proptsis, prolapse, from Greek, from propiptein, propt-, to fall forward : pro-, forward ; see pro-² + piptein, to fall; see pet- in Indo-European roots