endosteitis

noun
end·​os·​te·​itis | \ ˌen-ˌdäs-tē-ˈīt-əs How to pronounce endosteitis (audio) \
variants: or endostitis \ -​ˌdäs-​ˈtīt-​əs How to pronounce endostitis (audio) \

Medical Definition of endosteitis

: inflammation of the endosteum