| irides | Plural of iris. Origin: G. (05 Mar 2000) |
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| iridescent | Presenting multiple bright refractile colours, typically as a result of optical interference when incident white light is broken into its spectral components when reflected back through several thin-layered films. Origin: G. Iris, rainbow (05 Mar 2000) |
| iridescent virus | An insect virus in the family Iridoviridae. (05 Mar 2000) |
| iridesis | Ligature of a portion of the iris brought out through an incision in the cornea. Origin: irido-+ G. Desis, a binding together (05 Mar 2000) |