(pl irises or irides) the opaque contractile diaphragm perforated by the pupil that forms the coloured portion of the eye
(pl irises or irides
an adjustable diaphragm of thin opaque plates that can be moved to control the size of an aperture
(pl irises or or collectively iris) any of a large genus of plants with long straight leaves and large showy flowers: genus Iris
[via Latin from Greek iris rainbow, iris plant, iris of the eye]