Definitions of iris:

noun: diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
noun: muscular diaphragm that controls the size of the pupil; it forms the colored portion of the eye
noun: plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals
name: A female given name (common: 1 in 1818 females; popularity rank in the U.S.: #325)