An immature cell that develops into a granulocyte (a type of white blood cell).
From granulo- plus -blast, a suffix from Greek blastus meaning 'sprout' or 'bud.' Medical terminology uses -blast for all young, developing cells, particularly in blood and bone marrow.
Your bone marrow is constantly pumping out these baby white blood cells—granuloblasts are the teenagers of the immune system, not quite ready for action but training hard to become fierce infection-fighters.
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