What does iris mean? Definition, meaning and sense (original) (raw)

Pronunciation

Definition 1

The colored tissue at the front of the eye that contains the pupil in the center. The iris helps control the size of the pupil to let more or less light into the eye. (NCI Dictionary)

Definition 2

The colored disc of the eye composed of connective tissue, epithelium, and endothelium. It separates the anterior chamber from the posterior chamber. (NCI Thesaurus)

Definition 3

The most anterior portion of the uveal layer, separating the anterior chamber from the posterior. It consists of two layers - the stroma and the pigmented epithelium. Color of the iris depends on the amount of melanin in the stroma on reflection from the pigmented epithelium. (NLM, Medical Subject Headings)

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