ptosis

[toh-sis]

noun Pathology.

a drooping of the upper eyelid.
prolapse or drooping of any organ.

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 of ptosis

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.
Neuralgia and the Diseases that Resemble it
Francis E. Anstie
There was marked proptosis, subconjunctival ecchymosis, swelling and ecchymosis of the upper lid, and ptosis.
Surgical Experiences in South Africa, 1899-1900
George Henry Makins
Ptosis and lateral squint, with a fixed and dilated pupil, indicates pressure on the oculo-motor nerve of the same side.
Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition.
Alexander Miles

British Dictionary definitions for ptosis

ptosis

noun plural ptoses (ˈtəʊsiːz)

prolapse or drooping of a part, esp the eyelid

Derived Formsptotic (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

Word Origin and History for ptosis

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.

ptosis in Medicine

ptosis

[tō′sĭs]

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.