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

First Known Use of BLASTOCYST

1876

blastocyst

noun blas·to·cyst \ˈblas-tə-ˌsist\   (Medical Dictionary)

Medical Definition of BLASTOCYST

:  the modified blastula of a placental mammal

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