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. (The thin sheet of circular muscle of the iris which constricts the pupil of the eye is also known as a sphincter.)
    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. (The newspaperman had a love for a myriad of different flower species and soon divided his interests between roses, irises, lilacs and native California plants.)
    verb
    (of an aperture, typically that of a lens) open or close in the manner of an iris or iris diaphragm. (Ann tugged at his arm and pointed down to the hull's underbelly: a round opening had irised out in it, brightly lit from inside.)

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