Drooping eyelid, medically

• Drooping of the upper eyelid caused by muscle paralysis and weakness
• Piece of inexpensive padding surprisingly stops condition affecting eyelid
• Eyelid ailment

Wikipedia Word definitions in Wikipedia
Ptosis (from the Greek word πτῶσις "falling", "a fall", "dropped") refers to droopiness of a body part. Specifically, it can refer to: Ptosis (eyelid) (the most common usage of the term), a drooping of the upper or lower eyelid Ptosis (breasts) , refers ...

WordNet Word definitions in WordNet
n. drooping of the upper eyelid caused by muscle paralysis and weakness [also: ptoses (pl)]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
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 .

Wiktionary Word definitions in Wiktionary
n. The prolapse of a bodily organ, especially drooping of the eyelid or the breasts.