an·​ky·​lo·​sis | \ ˌaŋ-ki-ˈlō-səs How to pronounce ankylosis (audio) \
plural ankyloses\ ˌaŋ-​ki-​ˈlō-​ˌsēz How to pronounce ankyloses (audio) \

Definition of ankylosis

1 : stiffness or fixation of a joint by disease or surgery
2 : union of separate bones or hard parts to form a single bone or part

Other Words from ankylosis

ankylotic \ ˌaŋ-​ki-​ˈlä-​tik How to pronounce ankylotic (audio) \ adjective

First Known Use of ankylosis

1713, in the meaning defined at sense 1

History and Etymology for ankylosis

earlier ancylosis, anchylosis, borrowed from New Latin ancylosis, borrowed from Greek ankýlōsis "tongue-tie, stiffening of joints," from ankylō-, variant stem of ankyloûn "to crook, bend" (derivative of ankýlos "bent, crooked, curved") + -sis -sisangle entry 3

Keep scrolling for more

Learn More about ankylosis

Time Traveler for ankylosis

Time Traveler

The first known use of ankylosis was in 1713

See more words from the same year

Statistics for ankylosis

Cite this Entry

“Ankylosis.” Dictionary, Merriam-Webster, Accessed 30 May. 2020.

Keep scrolling for more

More Definitions for ankylosis


variants: also anchylosis \ ˌaŋ-​ki-​ˈlō-​səs How to pronounce anchylosis (audio) \
plural ankyloses\ -​ˌsēz How to pronounce ankyloses (audio) \

Medical Definition of ankylosis

: stiffness or fixation of a joint by disease or surgery

Other Words from ankylosis

ankylotic also anchylotic \ -​ˈlät-​ik How to pronounce anchylotic (audio) \ adjective

Comments on ankylosis

What made you want to look up ankylosis? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?

Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!