We're working on a new site. Click here to get a sneak preview.
Medical Dictionary


noun ep·i·the·li·um \ˌep-ə-ˈthē-lē-əm\
plural ep·i·the·lia \-lē-ə\

Medical Definition of EPITHELIUM

:  a membranous cellular tissue that covers a free surface or lines a tube or cavity of an animal body and serves especially to enclose and protect the other parts of the body, to produce secretions and excretions, and to function in assimilation

Illustration of EPITHELIUM

How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears