ankylosis
noun /ˌæŋkɪˈləʊsɪs/
/ˌæŋkɪˈləʊsɪs/
[uncountable] (medical)- a disease that causes one or more of the joints of the body to join together and become stiffWord Originearly 18th cent.: from Greek ankulōsis, from ankuloun ‘to crook’, from ankulos ‘crooked’.