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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

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.

See Examples For:

Doctors at Sunderland Royal Hospital were initially baffled and diagnosed her with ptosis, an eye condition characterised by the drooping of the upper eyelid, and told her to go home to rest.

From BBC Jul. 2, 2025

This process is called pyroptosis, from the Latin "pyro" for fire and the Greek "ptosis" for falling off, like the leaves of a tree.

From Salon Nov. 2, 2022

The 2-year-old from the Ivory Coast was born with closed eyelids, a condition known as bilateral congenital eyelid ptosis, often referred to as drooping eyelids.

From Washington Times Dec. 25, 2014

My physical state is deplorable—perpetual hiccough and ptosis of the left eyelid.

From The Parasite by Doyle, Arthur Conan, Sir

Atonia Gastrica, by which term is understood abdominal relaxation and ptosis of viscera, is a subject of vast importance, as has been proved by the avalanche of literature it has caused during the last decade.

From Napoleon's Campaign in Russia Anno 1812 by Rose, Achilles

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