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ptosis

Noun

pto=sis

WORDNET DICTIONARY

ptosis(n = noun.state) - drooping of the upper eyelid caused by muscle paralysis and weakness;

is a kind of descensus, prolapse, prolapsus

ptosis, n. [NL., fr. Gr. a falling.].

Drooping of the upper eyelid, produced by paralysis of its levator muscle. [1913 Webster]

ptosis, n. a drooping of the upper eyelid due to paralysis etc.

Derivative

ptotic adj.

Etymology

Gk ptosis f. pipto fall

For further exploring for "ptosis" in Webster Dictionary Online