Ankylosis

1. n. The union of two or more separate bones to from a single bone; the close union of bones or other structures in various animals.
2. n. Stiffness or fixation of a joint; formation of a stiff joint.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.