noun. the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall.
- tissue layer
- -blast (English)
- βλαστός (Ancient Greek (to 1453))
- tropho- (English)
- τροφή (Ancient Greek (to 1453))
Example sentences of the word trophoblast
1. Noun, singular or mass
Within 24 to 48 hours, small amounts of hCG are produced by the trophoblast, the layer of the embryo that eventually develops into the placenta.