\An`chy*lo"sis\, Ankylosis \An`ky*lo"sis\, n. [NL.,
fr. Gr. ?, fr. ?, fr. ? to crook, stiffen, fr. ? crooked: cf.
F. ankylose.]
1. (Med.) Stiffness or fixation of a joint; formation of a
   stiff joint. --Dunglison.

2. (Anat.) The union of two or more separate bones to from a
   single bone; the close union of bones or other structures
   in various animals.