I″ris (?), n.; pl. E. Irises (#), L. Irides (#). [L. iris, iridis, the goddess, Gr. �, �, the rainbow, iris of the eye, the plant Iris. Cf. Orris.] 1. (Class. Myth.) The goddess of the rainbow, and swift-footed messenger of the gods. Shak.
2. The rainbow. Sir T. Browne.
3. An appearance resembling the rainbow; a prismatic play of colors. Tennyson.
4. (Anat.) The contractile membrane perforated by the pupil, and forming the colored portion of the eye. See Eye.
5. (Bot.) A genus of plants having showy flowers and bulbous or tuberous roots, of which the flower-de-luce (fleur-de-lis), orris, and other species of flag are examples. See Illust. of Flower-de-luce.
6. (Her.) See Fleur-de-lis, 2.