Definitions

1. adjective

relating to or forming the epithelium, the outermost layer of cells on a plant or animal

“Epithelial cells play a crucial role in the human immune system.”

2. noun

the epithelium, the outermost layer of cells on a plant or animal

“The epithelial layer of the skin provides a barrier against external pathogens.”

3. noun

the epithelium of a plant, especially in relation to its leaf or root

“The epithelial cells of the plant root are involved in water and nutrient uptake.”