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1. (n.) trophoblast
the layer of extraembryonic ectoderm that nourishes the embryo or develops into fetal membranes with nutritive functions.
Etymology: (1885–90)
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| Definition of 'trophoblast' |
Princeton's WordNet |
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1. (noun) trophoblast
the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall
"after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"
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Definitions of trophoblast 
