ptosis
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pto·sis

noun \ˈtō-səs\
plural pto·ses \-ˌsēz\

Definition of PTOSIS

: a sagging or prolapse of an organ or part; especially : a drooping of the upper eyelid

Origin of PTOSIS

New Latin, from Greek ptōsis act of falling, from piptein
First Known Use: 1743

pto·sis

noun \ˈtō-səs\   (Medical Dictionary)
plural ; pto·ses \-ˌsēz\ (audio pronunciation)

Medical Definition of PTOSIS

: a sagging or prolapse of an organ or part <renal ptosis>; especially : a drooping of the upper eyelid (as from paralysis of the oculomotor nerve)

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