iris iris /ˈaɪrɪs/

noun

1. Diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening  ( iris , iris diaphragm )
   diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
   
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  ( iris )
   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
    The iris is the colored part of the eye that controls the size of the pupil
   The iris is the colored part of the eye that controls the size of the pupil
   
   
3. Plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals  ( fleur-de-lis , iris , sword lily , flag )
   plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
    The blue iris flowers were stunning in the garden
   The blue iris flowers were stunning in the garden