i·ris 
(īrĭs)
(īrĭs)n. pl. i·ris·es or i·ri·des (īrĭ-dēz′, ĭrĭ-)
1. The pigmented, round, contractile membrane of the eye, suspended between the cornea and lens and perforated by the pupil. It regulates the amount of light entering the eye.
2. Any of numerous widely cultivated plants of the genus Iris, having narrow sword-shaped leaves and showy, variously colored flowers.
3. A rainbow or rainbowlike display of colors.
4. An iris diaphragm.
[Middle English, iris (the plant), from Latin īris, īrid-, rainbow, iris (the plant), from Greek, rainbow, brightly-colored gemstone, iris of the eye; see wei- in the Appendix of Indo-European roots.]
irisIris × robusta
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