an·ky·lo·sis also an·chy·lo·sis 
(ăng′kə-lōsĭs)
(ăng′kə-lōsĭs)n.
1. The consolidation of bones or their parts to form a single unit.
2. The stiffening and immobility of a joint as the result of disease, trauma, surgery, or abnormal bone fusion.
[New Latin, from Greek ankulōsis, stiffening of the joints, from ankuloun, to crook, bend, from ankulos, crooked, bent.]
an′ky·lotic (-lŏtĭk) adj.