Main Entry: en·do·the·li·um

Pronunciation: \ˌen-də-ˈthē-lē-əm\

Function: noun

Inflected Form(s): plural en·do·the·lia \-lē-ə\

Etymology: New Latin, from end- + -thelium (as in epithelium)

Date: 1872

1 : an epithelium of mesodermal origin composed of a single layer of thin flattened cells that lines internal body cavities and the lumens of vessels
2 : the inner layer of the seed coat of some plants

— en·do·the·li·al \-lē-əl\ adjective