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.