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








