myelosis

noun
my·​e·​lo·​sis | \ ˌmī-ə-ˈlō-səs How to pronounce myelosis (audio) \
plural myeloses\ -​ˌsēz How to pronounce myeloses (audio) \

Medical Definition of myelosis

1 : the proliferation of bone marrow tissue to produce the changes in cell distribution typical of myelogenous leukemia