diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening | any of numerous wild or cultivated irises with hairlike structures on the falls (the drooping sepals) |
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 | |
plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals | |