Main Entry: en·do·derm

Pronunciation: \ˈen-də-ˌdərm\

Function: noun

Etymology: French endoderme, from end- + Greek derma skin — more at derm-

Date: 1861

: the innermost of the three primary germ layers of an embryo that is the source of the epithelium of the digestive tract and its derivatives and of the lower respiratory tract; also : a tissue derived from this layer

— en·do·der·mal \ˌen-də-ˈdər-məl\ adjective