[ ker-uh-tin ]
/ ˈkɛr ə tɪn /
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a fibrous, structural protein that is the principal constituent of hoofs, nails, claws, talons, bills, horn, hair, feathers, etc., and that is found in the outermost layers of skin.
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Words nearby keratin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for keratin
Rhino horns are made of keratin, the same protein found in our fingernails.‘Zoobiquity’: What Animals Can Teach Us About Our Health|Carl Zimmer|June 17, 2012|DAILY BEAST
Keratin is particularly rich in sulphur, and is quite insoluble in cold water.Principles and Practice of Fur Dressing and Fur Dyeing|William E. Austin
Keratin, a substance forming the chief constituent in the hair, nails, and horn of animals.The Nuttall Encyclopaedia|Edited by Rev. James Wood
British Dictionary definitions for keratin
/ (ˈkɛrətɪn) /
a fibrous protein that occurs in the outer layer of the skin and in hair, nails, feathers, hooves, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Medical definitions for keratin
[ kĕr′ə-tĭn ]
Any of a group of scleroproteins or albuminoids that contain large amounts of sulfur and are the chief structural constituents of hair, nails, and other horny tissues.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for keratin
[ kĕr′ə-tĭn ]
Any of a class of tough, fibrous proteins that are the main structural component of hair, nails, horns, feathers, and hooves. Keratins are rich in sulfur-containing amino acids, especially cysteine. Individual keratin molecules are entwined helically around each other in long filaments, which are cross-linked by bonds between sulfur atoms on different chains. The twining and cross-linking produce strength and toughness.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.