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WordNet records no synonym and no antonym for trophoblast. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
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”
Synonyms, antonyms and the broader and narrower relations for trophoblast come from Princeton University’s WordNet. Full sources and licences.