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ptosis

American  
[toh-sis] / ˈtoʊ sɪs /

noun

Pathology.
  1. a drooping of the upper eyelid.

  2. prolapse or drooping of any organ.


ptosis British  
/ ˈtəʊsɪs, ˈtɒtɪk /

noun

  1. prolapse or drooping of a part, esp the eyelid

"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

Other Word Forms

Derived Forms

Etymology

Origin of ptosis

1735–45; < New Latin < Greek ptṓsis a falling

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Ptosis is an ugly ailment of the upper eyelids.

From Time Magazine Archive

Ptosis, tō′sis, n. inability to raise the upper eyelid.

From Chambers's Twentieth Century Dictionary (part 3 of 4: N-R) by Various

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

From Manual of Surgery Volume Second: Extremities—Head—Neck. Sixth Edition. by Miles, Alexander

Ptosis, strabismus, paralysis of the bladder and rectum, of the muscles of deglutition, and even general paralysis, have been observed.

From A System of Practical Medicine by American Authors, Vol. I Volume 1: Pathology and General Diseases by Various

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