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1. (n.) keratin
a tough, insoluble protein that is the main constituent of hair, nails, horn, hoofs, etc., and of the outermost layer of skin.
Etymology: (1840–50; < Gk kerat-, s. of kérashorn+ -in1)
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| Definition of 'keratin' |
Princeton's WordNet |
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1. (noun) keratin, ceratin
a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves
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| Definition of 'keratin' |
Webster Dictionary |
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1. (noun) keratin
a nitrogenous substance, or mixture of substances, containing sulphur in a loose state of combination, and forming the chemical basis of epidermal tissues, such as horn, hair, feathers, and the like. It is an insoluble substance, and, unlike elastin, is not dissolved even by gastric or pancreatic juice. By decomposition with sulphuric acid it yields leucin and tyrosin, as does albumin. Called also epidermose
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| Definitions of 'keratin' |
The Nuttall Encyclopedia |
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1. keratin
a substance forming the chief constituent in the hair, nails, and horn of animals.
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Definitions of keratin 
