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

keratin

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