Search Result for "trophoblast": 
Wordnet 3.0

NOUN (1)

1. the membrane that forms the wall of the blastocyst in early development; aids implantation in the uterine wall;
- Example: "after implantation of the blastocyst in the uterine wall the trophoblast divides into two layers, the chorion and the placenta"



WordNet (r) 3.0 (2006):

trophoblast
    n 1: 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"