Found 2 items, similar to Ptosis.
English → English (WordNet) Definition: ptosis ptosis n : drooping of the upper eyelid caused by muscle paralysis and weakness [also: ptoses (pl)]
English → English (gcide) Definition: Ptosis Ptosis \Pto"sis\, n. [NL., fr. Gr. ? a falling.] (Med.) Drooping of the upper eyelid, produced by paralysis of its levator muscle. [1913 Webster]