blas·to·cyst noun \ˈblas-tə-ˌsist\
: the modified blastula of a placental mammal having an outer layer composed of the trophoblast
First Known Use of BLASTOCYST
blas·to·cyst noun \ˈblas-tə-ˌsist\ (Medical Dictionary)
: the modified blastula of a placental mammal
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