• synonyms


noun Pathology.
  1. a drooping of the upper eyelid.
  2. prolapse or drooping of any organ.
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Origin of ptosis

1735–45; < New Latin < Greek ptṓsis a falling
Related formspto·tic [toh-tik] /ˈtoʊ tɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for ptotic


noun plural ptoses (ˈtəʊsiːz)
  1. prolapse or drooping of a part, esp the eyelid
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Derived Formsptotic (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

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

ptotic in Medicine


  1. Relating to or characterized by ptosis.
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n. pl. pto•ses (-sēz)
  1. Abnormal lowering or drooping of an organ or part, especially a drooping of the upper eyelid caused by muscle weakness or paralysis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.