cytotrophoblast
noun
cy·to·tro·pho·blast
| \ ˌsīt-ə-ˈtrō-fə-ˌblast
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Medical Definition of cytotrophoblast
: 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