Ptosis

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Ptosis \Pto"sis\ (t[=o]"s[i^]s), n. [NL., fr. Gr. ptw^sis a
     falling.] (Med.)
     Drooping of the upper eyelid, produced by paralysis of its
     levator muscle.
     [1913 Webster]



From WordNet (r) 2.0 [wn]:

  ptosis
       n : drooping of the upper eyelid caused by muscle paralysis and
           weakness
       [also: {ptoses} (pl)]