hyperchromatosis

noun
hy·​per·​chro·​ma·​to·​sis | \ -ˌkrō-mə-ˈtō-səs How to pronounce hyperchromatosis (audio) \
plural hyperchromatoses\ -​ˌsēz How to pronounce hyperchromatoses (audio) \

Medical Definition of hyperchromatosis