hemocytoblast

noun

he·​mo·​cy·​to·​blast

variants or chiefly British haemocytoblast

ˌhē-mə-ˈsīt-ə-ˌblast 

: a stem cell for blood-cellular elements

especially : one considered competent to produce all types of blood cell

called also lymphoidocyte

hemocytoblastic adjective

or chiefly British haemocytoblastic

-ˌsīt-ə-ˈblast-ik