DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   iris
       n 1: plants with sword-shaped leaves and erect stalks bearing
            bright-colored flowers composed of three petals and three
            drooping sepals [syn: iris, flag, fleur-de-lis,
            sword lily]
       2: muscular diaphragm that controls the size of the pupil which
          in turn controls the amount of light that enters the eye; it
          forms the colored portion of the eye
       3: diaphragm consisting of thin overlapping plates that can be
          adjusted to change the diameter of a central opening [syn:
          iris, iris diaphragm]