anchylosis
anchylosis (an`ki*lō"sis) , noun
[New Latin, from Greek 'agky`lwsis, from 'agkyloy^n to crook, stiffen, from 'agky`los crooked: compare French ankylose.]
1.
(Medicine) The process of formation of a stiff joint; also, the abnormal adhesion and rigidity of the bones of a joint which has become stiff. — Dunglison
2.
(Anatomy) The union of two or more separate bones to from a single bone; the close union of bones or other structures in various animals.
Also: ankylosis