English Reference

Word

epithelial

Phoneticsep·ithe·lial

/ɛpɪˈθɛɫjəɫ/

Definition

adj. describing the thin layer of cells that covers the outside of your body and lines your internal organs. These cells act like a protective skin or lining for your parts.

adj. relating to the thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures. Typically used in medical or biological contexts to describe specific cell types or tissues.

Examples

“The doctor examined the epithelial cells under a microscope.”

“Epithelial tissue serves as a primary barrier against pathogens by covering all external surfaces of the body.”

“Research into epithelial-mesenchymal transition is crucial for understanding how certain cancers develop the ability to migrate from their primary site to other parts of the body.”

Examples

simple

“The doctor examined the epithelial cells under a microscope.”

contextual

“Epithelial tissue serves as a primary barrier against pathogens by covering all external surfaces of the body.”

complex

“Research into epithelial-mesenchymal transition is crucial for understanding how certain cancers develop the ability to migrate from their primary site to other parts of the body.”

Usage

Typically used as an attributive adjective preceding the noun it modifies, such as 'tissue', 'cells', or 'lining'.

Real-World Examples

“The University of Louisville team found that UroA selectively activates AHR in intestinal epithelial cells, which are the specialized cells that form and protect the gut lining.”
ScienceDaily · 17 Sept 2026
“Epithelial cells are the tiny shields that line and protect our bodies.”
Phys.org · 14 Aug 2026

Etymology

From epithelium + -al. By surface analysis, epi- + thel- + -i- + -al.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Domain

Anatomy

This entry

Level
C2 · Proficiency
Frequency
Occasional
Updated

Scan code

englishreference.com/q/epithelial

English Reference