syncytiotrophoblast
noun
syn·cy·tio·tro·pho·blast
| \ sin-ˌsish-ē-ō-ˈtrō-fə-ˌblast
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Medical Definition of syncytiotrophoblast
: the outer syncytial layer of the trophoblast that actively invades the uterine wall forming the outermost fetal component of the placenta
— called also syntrophoblast
— compare cytotrophoblast