Dictionary

ptosis

noun pto·sis \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
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Origin of PTOSIS

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

ptosis

noun pto·sis \ˈtō-səs\
plural pto·ses \-ˌsēz\

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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