Meaning : Plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals.

Meaning : 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.

Meaning : Diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening.