pneumatosis

noun
pneu·​ma·​to·​sis | \ ˌn(y)ü-mə-ˈtō-səs How to pronounce pneumatosis (audio) \
plural pneumatoses\ -​ˌsēz How to pronounce pneumatoses (audio) \

Medical Definition of pneumatosis

: the presence of air or gas in abnormal places in the body