noun (n)

• plants with sword-shaped leaves and erect stalks bearing bright-colored flowers composed of three petals and three drooping sepals(noun.plant)

  Synonym:
  flag, fleur-de-lis, sword lily
  

  source: wordnet30
• muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye(noun.body)

  source: wordnet30
• diaphragm consisting of thin overlapping plates that can be adjusted to change the diameter of a central opening(noun.artifact)

  Synonym:
  iris diaphragm
  

  source: wordnet30
• The goddess of the rainbow, and swift-footed messenger of the gods.(noun)

  source: webster1913
• Inner circle of an oscillated color spot.(noun)

  source: webster1913