ˌ ̷ ̷ ̷ ̷ˈ ̷ ̷lēəm noun
( plural endothe·lia -ēə)
Etymology: New Latin, from end- + -thelium (as in epithelium )
1. : an epithelium of mesoblastic origin composed of a single layer of thin flattened cells that lines internal body cavities (as the serous cavities or the interior of the heart)
2. : the inner layer of the seed coat of certain plants whose cells upon disorganization of the nucellus elongate radically and form a nutritive layer around the embryo sac
• en·do·the·loid | ̷ ̷ ̷ ̷| ̷ ̷ˌlȯid adjective