noun, Pathology.
a drooping of the upper eyelid.
prolapse or drooping of any organ.
noun (pl) ptoses (ˈtəʊsiːz)
prolapse or drooping of a part, esp the eyelid

ptotic ptot·ic (tŏt’ĭk)
Relating to or characterized by ptosis.

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

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