• synonyms


[ toh-sis ]
/ ˈtoʊ sɪs /

noun Pathology.

a drooping of the upper eyelid.
prolapse or drooping of any organ.

Nearby words

ptolemy i, ptolemy ii, ptomaine, ptomaine poisoning, ptosed, ptosis, ptotic, ptp., pts, pts., ptsd

Origin of ptosis

1735–45; < New Latin < Greek ptṓsis a falling
Related formspto·tic [toh-tik] /ˈtoʊ tɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for ptotic


/ (ˈtəʊsɪs) /

noun plural ptoses (ˈtəʊsiːz)

prolapse or drooping of a part, esp the eyelid
Derived Formsptotic (ˈtɒtɪk), adjective

Word Origin for ptosis

C18: from Greek: a falling
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

Word Origin and History for ptotic



1743, from Greek ptosis, literally "falling, a fall," also "the case of a noun," nominal derivative of piptein "to fall" (see symptom). In English, especially of the eyelid. Related: Ptotic.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ptotic (1 of 2)


[ tŏtĭk ]


Relating to or characterized by ptosis.

Medicine definitions for ptotic (2 of 2)


[ tōsĭs ]

n. pl. pto•ses (-sēz)

Abnormal lowering or drooping of an organ or part, especially a drooping of the upper eyelid caused by muscle weakness or paralysis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.