Epithelial (adjective)

Relating to or denoting the epithelium, the cells that form the outer layer of the skin or the inner lining of body cavities, tubes, and structures.

Origin:

Mid 19th century: from greek epithelios "on or near the skin", from epi "upon" + thele "nipple".

Examples:

1. The epithelial cells form a barrier to protect the body from foreign substances.
2. The epithelial tissue in the lungs helps in the exchange of gases.
3. Epithelial cancer is a common type of cancer that affects the epithelial cells.
4. The epithelial cells in the gut are constantly renewing themselves.
5. The study of epithelial cells is important in understanding various diseases.