hemocytogenesis
noun
he·mo·cy·to·gen·e·sis
variants:
or chiefly British haemocytogenesis \ ˌhē-mō-ˌsīt-ə-ˈjen-ə-səs 
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plural hemocytogeneses\ -ˌsēz
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Medical Definition of hemocytogenesis
: the part of hematopoiesis concerned with the formation of blood cells