From The Collaborative International Dictionary of English v.0.48 [gcide]:
Collagen \Col"la*gen\, noun [Gr. ko'lla glue + -gen.] (Physiol. Chem.) 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.
From WordNet (r) 3.0 (2006) [wn]:
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