Definition of collagen noun from the Oxford Advanced Learner's Dictionary

 

collagen

 noun
noun
BrE BrE//ˈkɒlədʒən//
 
; NAmE NAmE//ˈkɑːlədʒən//
 
[uncountable]
 
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a protein found in skin and bone, sometimes injected into the body, especially the face, to improve its appearance collagen injections Word Origin mid 19th cent.: from French collagène, from Greek kolla ‘glue’ + French -gène (from Greek genēs ‘-born, of a specified kind’).
See the Oxford Advanced American Dictionary entry: collagen