noun
also an·chy·lo·sis or an·cy·lo·sis ˌ ̷ ̷ ̷ ̷ˈlōsə̇s
( plural ankylo·ses also anchylo·ses or ancylo·ses -ōˌsēz)
Etymology: New Latin, from Greek ankylōsis stiffening tongue-tie, adhesion of the eyelids, from ankyloun to crook, stiffen (from ankylos crooked) + -ōsis -osis — more at angle
1. : stiffness or fixation of a joint by disease or surgery : formation of a stiff joint through obliteration of the joint space by fibrous or bony tissue
2. : union of two or more separate bones or other hard parts to form a single bone or part without intervening soft tissues