follow Dictionary.com

Fiancé or fiancée? What's the difference?

keratin

[ker-uh-tin] /ˈkɛr ə tɪn/
noun
1.
a scleroprotein or albuminoid substance, found in the dead outer skin layer, and in horn, hair, feathers, hoofs, nails, claws, bills, etc.
Origin of keratin
1840-1850
1840-50; kerat- + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for keratin
British Dictionary definitions for keratin

keratin

/ˈkɛrətɪn/
noun
1.
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
Cite This Source
Word Origin and History for keratin
n.

basic substance of horns, nails, feathers, etc., 1847, from Greek keras (genitive keratos) "horn" (see kerato-) + chemical suffix -in (2).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
keratin in Medicine

keratin ker·a·tin (kěr'ə-tĭn)
n.
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.
Cite This Source
keratin in Science
keratin
  (kěr'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 © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source

Word of the Day

Difficulty index for keratin

Most English speakers likely know this word

Word Value for keratin

11
12
Scrabble Words With Friends

Nearby words for keratin