pto·sis /ˈtosəs/
下垂症
pto·sis /ˈtosəs/ 名詞
Pto·sis n. Med. Drooping of the upper eyelid, produced by paralysis of its levator muscle.
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ptosis
n : drooping of the upper eyelid caused by muscle paralysis and
weakness
[also: ptoses (pl)]