Definition

A type of tissue made up of one or more layers of cells that covers surfaces and lines cavities in the body, helping to protect and support other tissues.

Example

The epithelium of the skin acts as a barrier against infection.

Conversation

Have you ever heard of epithelium in biology class?

Yeah, I remember it being about the tissue that covers surfaces.

Right! It’s interesting how it protects and lines organs.

Totally! I find it fascinating how our bodies work.

Synonyms & Antonyms

Root Explanation

Epithelium → It is formed from the prefix "epi-" (meaning upon or over) and the root "thele" (from Greek "thēlē", meaning nipple or projection). The word "epithelium" refers to a tissue that covers or lines surfaces, thus being situated upon or over other tissues.

Memory Tip

Think of a layer that is 'upon' ('epi-') a surface, like a protective covering, which is what epithelium refers to.

Visually Confused Words