Dictionary
blastocyst
noun blas·to·cyst \ˈblas-tə-ˌsist\
Definition of BLASTOCYST
: the modified blastula of a placental mammal having an outer layer composed of the trophoblast
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First Known Use of BLASTOCYST
1876
Medical Dictionary
blastocyst
noun blas·to·cyst \ˈblas-tə-ˌsist\
Medical Definition of BLASTOCYST
: the modified blastula of a placental mammal
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