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.