Real Dictionary

endothelium
a direct ancestor [...]
a small simple room, as in a prison, convent, or monastery; cubicle [...]
a tissue consisting of a single layer of cells that lines the blood and lymph vessels, heart, and some other cavities [...]
any compound of oxygen with another element [...]
any disturbance or abnormality in the function of an organ or part [...]
anything serving to obstruct passage or to maintain separation, such as a fence or gate [...]
of or containing nitrogen, esp in the pentavalent state [...]
rapid growth or reproduction of new parts, cells, etc [...]
the natural action or intended purpose of a person or thing in a specific role [...]