IRIS (Internet Routing in Space)
WordNet
noun
(1) 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; it forms the colored portion of the eye
(3) Plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals