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BNC: 0 COCA: 35246
keratin
noun [U] biology /ˈkerətɪn/
  1. a protein that is the main substance that hair, nails, feathers, and horns are made of
     Synonyms and related words
    The skin, bones and fur of animals:armor, armour, beard...
BNC: 0 COCA: 35246
BNC: 0 COCA: 35246

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