cytotrophoblast

noun

cy·​to·​tro·​pho·​blast ˌsīt-ə-ˈtrō-fə-ˌblast 

: the inner cellular layer of the trophoblast of an embryonic placental mammal that gives rise to the plasmodial syncytiotrophoblast covering the placental villi

called also Langhans' layer, layer of Langhans

cytotrophoblastic

-ˌtrō-fə-ˈblas-tik 

adjective