a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling
"The chef added extra collagen-rich bones to the broth so it would turn into rich, silky gelatin once simmered."
Any of more than 28 types of glycoprotein that form elongated fibers, usually found in the extracellular matrix of connective tissue.
"Collagen forms the structural framework within our skin and bones as part of the extracellular matrix of connective tissue."