Search Result for "mydriasis": 
Wordnet 3.0

NOUN (1)

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



The Collaborative International Dictionary of English v.0.48:

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]


WordNet (r) 3.0 (2006):

mydriasis
    n 1: reflex pupillary dilation as a muscle pulls the iris
         outward; occurs in response to a decrease in light or
         certain drugs