iris

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iris
  • noun
    A flat, colored, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the center.
    A plant with sword-shaped leaves and showy flowers, typically purple, yellow, or white. Native to both Eurasia and North America, it is widely cultivated as an ornamental.
    verb
    (of an aperture, typically that of a lens) open or close in the manner of an iris or iris diaphragm.

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