Definitions

1. noun

A layer or lining of cells forming the lining or covering of a gland or other bodily organ, such as the skin, lungs, or gut.

“The epithelia of the lungs play a crucial role in gas exchange.”

2. noun

Tissues of epithelial origin, especially those forming the lining or covering of a gland or other bodily organ.

“The epithelia of the skin provide a protective barrier against external factors.”