Collagen

[kɒlәdʒin]

(noun.) a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling.

Inputed by Clara--From WordNet

(n.) The chemical basis of ordinary connective tissue, as of tendons or sinews and of bone. On being boiled in water it becomes gelatin or glue.

Checker: Trent