Main entry: iris, iris diaphragm
Definition: diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening
Main entry: iris
Definition: 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
Main entry: flag, fleur-de-lis, iris, sword lily
Definition: plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals