The term 'Iris Layers' refers to the three layers of the iris, which is the colored part of the eye. The first layer is the uvea, which is a five-letter word and is also known as the uveal tract. This layer consists of the choroid, ciliary body, and the iris itself. The second layer is the stroma, which is composed of connective tissue and contains blood vessels and muscles. The third layer is the pigmented epithelium, which is responsible for the color of the iris.