• WordNet 3.6
    • n keratin a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves
    • ***
Webster's Revised Unabridged Dictionary
  • Interesting fact: Hair and fingernails are made from the same substance, keratin
    • n keratin (Physiol. Chem) A sulfur-containing fibrous protein constituting the main structural protein of hard epidermal tissues, such as horn, hair, feathers, nails, claws, hoofs, 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 leucine and tyrosine plus various other acid-stable amino acids. The amino acid composition varies, but it usually has a high percentage of cystine, which stabilizes and insolubilizes the protein by forming intrachain linkages. A softer form of keratin is present in the epidermis and whalebone. Called also epidermose.
    • ***
Century Dictionary and Cyclopedia
    • n keratin Same as ceratin.
    • ***
Chambers's Twentieth Century Dictionary
    • Keratin a nitrogenous compound, the essential ingredient of horny tissue, as of horns, nails, &c
    • ***


Webster's Revised Unabridged Dictionary
Gr. ke`ras -atos, horn
Chambers's Twentieth Century Dictionary
Gr. keras, a horn.


In literature:

KERATIN, a substance forming the chief constituent in the hair, nails, and horn of animals.
"The Nuttall Encyclopaedia" by Edited by Rev. James Wood
They are very similar to the peptones obtained from keratins and gelatins.
"Animal Proteins" by Hugh Garner Bennett

In news:

She commented many clients use the Keratin fibers to cover root re-growth thereby extending in-between visits with a colorist.
We've all heard about the costly keratin salon treatments that purportedly reverse the effects of abuse and tame frizzy and flyaway hair.
It was only a matter of time before marketers broadened their keratin products to apply to the at-home market.
125 Coupon for Keratin Smoothing System.
Be a Blondeshell with Keratin Complex.
Results From Our At-Home Keratin Treatment Study.
Save 20% at Eva's, Reductions Up to 75% at March Boutique, and 50% off Keratin Treatments at The Salon.
The Straight Truth About Keratin and Other Hair Smoothing Treatments.
AQP-3 Ingredient May Improve Keratinization .
Testing the new at-home Keratin treatment from Sephora.
We've been steadily reviewing Keratin products for two years, so at this point, it's safe to say we're obsessed.
We will begin with the basic fundamentals and move into a more creative and alternative approach of permanent waves, relaxers and the keratin straightening treatment.
"Formaldehyde, commonly found in a number of 'Brazilian style' keratin-based hair straighteners , is extremely dangerous and a known carcinogen," the FDA says.
The research team, led by Suzanne Fleiszig of the School of Optometry, found that tiny molecules of keratin protein in the eye are really good at killing bugs .
The research team, led by Suzanne Fleiszig of the School of Optometry, found that tiny molecules of keratin protein in the eye are really good at killing bugs.

In science:

McLachlan A.D. (1978) Coiled coil formation and sequence regularities in the helical regions of a-keratin. J.
A web server to locate periodicities in a sequence