English

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

 

keratin

 noun
noun
BrE BrE//ˈkerətɪn//
 
; NAmE NAmE//ˈkerətɪn//
 
[uncountable] (biology)
 
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a protein that forms hair, feathers, horns, hoofs, etc. Word Origin mid 19th cent.: from Greek keras, kerat- ‘horn’ + -in.
See the Oxford Advanced American Dictionary entry: keratin