Pronunciation: i'ris, ir'i-dez
The anterior division of the vascular tunic of the eye, a diaphragm, perforated in the center (the pupil), attached peripherally to the scleral spur; it is composed of stroma and a double layer of pigmented retinal epithelium from which are derived the sphincter and dilator muscles of the pupil.
[G. rainbow, the iris of the eye]
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Examples: glitazone, GI cocktail, etc.