cardiosclerosis

noun
car·​dio·​scle·​ro·​sis | \ ˌkärd-ē-(ˌ)ō-sklə-ˈrō-səs How to pronounce cardiosclerosis (audio) \
plural cardioscleroses\ -​ˌsēz How to pronounce cardioscleroses (audio) \

Medical Definition of cardiosclerosis

: induration of the heart caused by formation of fibrous tissue in the cardiac muscle