iris

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iris
  • noun
    A flat, coloured, ring-shaped membrane behind the cornea of the eye, with an adjustable circular opening (pupil) in the centre.
    A plant with showy flowers, typically of purple or yellow, and sword-shaped leaves. Irises are native to both Eurasia and North America and widely cultivated as ornamentals.
    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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