/ ˈkɒlədʒən; NAmE ˈkɑːl-/ noun
[ U ] a protein found in skin and bone, sometimes injected into the body, especially the face, to improve its appearance :
collagen injections
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WORD ORIGIN
mid 19th cent.: from French collagène , from Greek kolla glue + French -gène (from Greek genēs -born, of a specified kind).