Definitionen
1.NounA plant of the genus Iris, common in the northern hemisphere, and generally having attractive blooms (See Iris (plant) on Wikipedia.Wikipedia ).
2.NounThe contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina, and which forms the colored portion of the eye (See Iris (anatomy) on Wikipedia.Wikipedia ).
3.NounA diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens.
4.NounA rainbow, or other colourful refraction of light.
5.NounA constricted opening in the path inside a waveguide, used to form a resonator.
6.NounThe inner circle of an oscillated color spot.
7.VerbTo open or close in the manner of an iris.
8.VerbTo cause (something) to shine with the colours of the rainbow; to make iridescent.