Final answer:
Epithelial cells with multiple layers are referred to as stratified epithelium. This type of tissue has more than one layer of cells, with examples including the epidermis of the skin.
Step-by-step explanation:
If epithelial cells have many layers, they are referred to as being stratified epithelium. Epithelial tissues, which cover the outside of organs and line organs within the body, are classified by both the shape of the cells they contain and the number of cell layers present. The types of epithelia are simple epithelia (a single layer of cells) and stratified epithelia (multiple layers of cells). Where epithelial cells stack up in layers, they form what is known as stratified epithelium. An example of this is the epidermis of the skin, which is composed of multiple layers. The outer layers are typically squamous, keratinized cells originating from a basal layer of cuboidal cells.
Epithelial cells can be classified based on the number of cell layers they have. If epithelial cells have many layers, they are referred to as being stratified epithelial cells.