arthrodesis
noun
ar·throd·e·sis är-ˈthrä-də-səs 
plural arthrodeses är-ˈthrä-də-ˌsēz
: the surgical immobilization of a joint so that the bones grow solidly together
Word History
Etymology
borrowed from German Arthrodese, from arthro- arthro- + -dese, borrowed from Greek désis "act of binding together," from déō, deîn "to bind, tie" + -sis -sis — more at diadem
First Known Use
1888, in the meaning defined above
Medical Definition
arthrodesis
noun
ar·throd·e·sis är-ˈthräd-ə-səs
plural arthrodeses -ˌsēz
: the surgical immobilization of a joint so that the bones grow solidly together : artificial ankylosis