The part of the eye that contains the iris and ciliary body and choroid WordNet 3.0 & Open English WordNet

The uvea, also called the uveal layer, uveal coat, uveal tract, vascular tunic or vascular layer is the pigmented middle layer of the three concentric layers that make up an eye, precisely between the inner retina and the outer fibrous layer composed of the sclera and cornea. Wikipedia

Pigmented middle of the three concentric layers that make up an eye Wikidata

The middle of the three concentric layers that make up the eye; it is pigmented and vascular, and comprises the choroid, the ciliary body, and the iris. Wiktionary

The middle of the three concenctric layers that make up the eye. Wiktionary (translation)