Etymology
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collagen (n.)

also collogen, structural protein of connective tissue, 1843, from French collagène, from Latinized form of Greek kolla "glue" + -gen "giving birth to" (see -gen). Related: Collagenous.

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Definitions of collagen

collagen (n.)
a fibrous scleroprotein in bone and cartilage and tendon and other connective tissue; yields gelatin on boiling;
From wordnet.princeton.edu