iris -
muscular diaphragm that controls the size of the pupil which in turn controls the amount of light that enters the eye; it forms the colored portion of the eye
iris -
A diaphragm used to regulate the size of a hole, especially as a way of controlling the amount of light reaching a lens.
iris -
A rainbow, or other colourful refraction of light.
iris -
A constricted opening in the path inside a waveguide, used to form a resonator.
OmegaWiki Dictionary
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iris The contractile membrane perforated by the pupil, which adjusts to control the amount of light reaching the retina.
iris A flower of any of the species belonging to the genus Iris; the flowers occur in many colours, have long and slender pointed leaves, and either a corm or a rhizome.