morula

English Thesaurus

1. a solid mass of blastomeres that forms when the zygote splits; develops into the blastula (noun.animal)

hypernym	:	conceptus, embryo, fertilized egg,
definition	:	an animal organism in the early stages of growth and differentiation that in higher forms merge into fetal stages but in lower forms terminate in commencement of larval life (noun.animal)