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[toh-sis] /ˈtoʊ sɪs/
noun, Pathology
a drooping of the upper eyelid.
prolapse or drooping of any organ.
Origin of ptosis
1735-45; < New Latin < Greek ptṓsis a falling
Related forms
[toh-tik] /ˈtoʊ tɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for ptosis


noun (pl) ptoses (ˈtəʊsiːz)
prolapse or drooping of a part, esp the eyelid
Derived Forms
ptotic (ˈtɒtɪk) adjective
Word Origin
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
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Word Origin and History for ptosis

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
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ptosis in Medicine

ptosis pto·sis (tō'sĭs)
n. pl. pto·ses (-sēz)
Abnormal lowering or drooping of an organ or a 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.
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