collagen

n. insoluble fibrous protein (Biology)

Collagen is the main protein of connective tissue in animals and the most abundant protein in mammals, making up about 25% of the total protein content.
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Collagen /col·la·gen/ any of a family of extracellular, closely related proteins occurring as a major component of connective tissue, giving it [more]Collagen - Community and Resources

Noun
1. a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling
(hypernym) scleroprotein, albuminoid
(substance-holonym) bone, os

n. collage, artwork composed of numerous images pasted on a board or canvas; medley, musical composition which is comprised of a number of separate melodies from other musical pieces