Main Entry: en·do·derm

Pronunciation: \ˈen-də-ˌdərm\

Function: noun

: 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 that is derived from this germ layer

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