n. any of the cells produced by *cleavage of the zygote, comprising the earliest stages of embryonic development until the formation of the *blastocyst. Blastomeres divide repeatedly without growth and so decrease in size.
n. (in embryology) the process of repeated cell division of the fertilized egg to form a ball of cells that becomes the *blastocyst. The cells (blastomeres) do not grow between divisions and so they decrease in size.... cleavage
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