hemoblastosis

noun
he·​mo·​blas·​to·​sis
variants: or chiefly British haemoblastosis \ ˌhē-​mə-​ˌblas-​ˈtō-​səs How to pronounce haemoblastosis (audio) \
plural hemoblastoses\ -​ˌsēz How to pronounce hemoblastoses (audio) \

Medical Definition of hemoblastosis

: abnormal proliferation of the blood-forming tissues