blas·to·mere /ˈblæstəˌmɪr/
  分裂球; 卵裂球
  blas·to·mere /ˈblæstəˌmɪ(ə)r/ 名詞
  (卵)裂球,(分)裂球,卵裂細胞
  Blas·to·mere n.  Biol. One of the segments first formed by the division of the ovum.
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  blastomere
       n : any cell resulting from cleavage of a fertilized egg