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me·dul·lo·blast | \ mə-ˈdəl-ə-ˌblast 
, ˈmej-ə-lə- \
, ˈmej-ə-lə- \Medical Definition of medulloblast
: a primitive undifferentiated nerve cell of the neural tube that is capable of developing into either a neuroblast or a spongioblast and that is found in medulloblastomas
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