Dictionary.com

ptosis

[ toh-sis ]
/ ˈtoʊ sɪs /
Save This Word!

noun Pathology.
a drooping of the upper eyelid.
prolapse or drooping of any organ.
QUIZ
ARE YOU A TRUE BLUE CHAMPION OF THESE "BLUE" SYNONYMS?
We could talk until we're blue in the face about this quiz on words for the color "blue," but we think you should take the quiz and find out if you're a whiz at these colorful terms.
Question 1 of 8
Which of the following words describes “sky blue”?
Meet Grammar CoachWrite or paste your essay, email, or story into Grammar Coach and get grammar helpImprove Your Writing
Meet Grammar CoachImprove Your Writing
Write or paste your essay, email, or story into Grammar Coach and get grammar help

Origin of ptosis

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

OTHER WORDS FROM ptosis

pto·tic [toh-tik], /ˈtoʊ tɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use ptosis in a sentence

British Dictionary definitions for ptosis

ptosis
/ (ˈtəʊsɪs) /

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

Derived forms of ptosis

ptotic (ˈtɒtɪk), adjective

Word Origin for ptosis

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

Medical definitions for ptosis (1 of 2)

ptosis
[ tōsĭs ]

n. pl. pto•ses (-sēz)
Abnormal lowering or drooping of an organ or part, especially a drooping of the upper eyelid caused by muscle weakness or paralysis.

Medical definitions for ptosis (2 of 2)

-ptosis

suff.
Downward displacement or position:blepharoptosis.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
FEEDBACK