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Iris iris  

Definition & Synonyms

• Iris

  1. (n.) An appearance resembling the rainbow; a prismatic play of colors.
  2. (n.) See Fleur-de-lis, 2.
  3. (n.) The rainbow.
  4. (n.) 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.
  5. (n.) The contractile membrane perforated by the pupil, and forming the colored portion of the eye. See Eye.
  6. (n.) The goddess of the rainbow, and swift-footed messenger of the gods.
  7. (n.) Inner circle of an oscillated color spot.

Flag, Fleur-de-lis, Iris diaphragm,

• Iris diaphragm

  1. () An adjustable diaphragm, suggesting the iris of the eye in its action, for regulating the aperture of a lens, consisting of a number of thin pieces fastened to a ring. It is used in cameras and microscopes.