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ptosis

[toh-sis]
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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

Examples from the Web for ptosis

Historical Examples

  • This was diagnosed as ptosis of his organs, and an operation was done to tuck these up.

    Psychotherapy

    James J. Walsh

  • Eye-strain is another; ptosis, or falling of the organs, is another.

    Outwitting Our Nerves

    Josephine A. Jackson and Helen M. Salisbury

  • Frequent transitory or permanent strabismus or ptosis, one or both.

  • There was marked proptosis, subconjunctival ecchymosis, swelling and ecchymosis of the upper lid, and ptosis.

  • Ptosis and lateral squint, with a fixed and dilated pupil, indicates pressure on the oculo-motor nerve of the same side.


British Dictionary definitions for ptosis

ptosis

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 ptosis

n.

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

ptosis in Medicine

ptosis

(tōsĭs)
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.