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

(of an aperture, typically that of a lens) open or close in the manner of an iris or iris diaphragm