medionecrosis

noun
me·​dio·​ne·​cro·​sis | \ -ni-ˈkrō-səs How to pronounce medionecrosis (audio) \
plural medionecroses\ -​ˌsēz How to pronounce medionecroses (audio) \

Medical Definition of medionecrosis

: necrosis of the media of a blood vessel cystic medionecrosis of the aorta