Etymology
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ptosis (n.)

"a falling of or inability to raise the upper eyelid," 1743, from Greek ptōsis, literally "falling, a fall," also "the case of a noun," nominal derivative of piptein "to fall" (from PIE *pi-pt-, reduplicated form of root *pet- "to rush; to fly"). In English, especially of the eyelid. Related: Ptotic.

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Definitions of ptosis

ptosis (n.)
drooping of the upper eyelid caused by muscle paralysis and weakness;
From wordnet.princeton.edu