hemoendothelial

adjective

he·​mo·​en·​do·​the·​li·​al

variants or chiefly British haemoendothelial

-ˌen-də-ˈthē-lē-əl 

of a placenta

: having the fetal villi reduced to bare capillary loops that are bathed in maternal blood

higher rodents are hemoendothelial