Mydriasis

2 definitions found

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

  Mydriasis \My*dri"a*sis\, n. [L., fr. Gr. ?.] (Physiol. & Med.)
     A long-continued or excessive dilatation of the pupil of the
     eye.
     [1913 Webster]

From WordNet (r) 2.0 [wn]:



  mydriasis
       n : reflex pupillary dilation as a muscle pulls the iris
           outward; occurs in response to a decrease in light or
           certain drugs