keratin

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ker·a·tin

 (kĕr′ə-tĭn)
n.
1. Any of a class of filamentous proteins that are abundant in the cytoskeleton of vertebrate epithelial cells and are the main constituents of the outer layer of skin and tough epidermal structures such as hair, nails, hooves, feathers, and claws.
2. Material composed principally of keratin proteins.

[Greek keras, kerāt-, horn; see ker- in Indo-European roots + -in.]

ke·rat′i·nous (kə-răt′n-əs) adj.

keratin

(ˈkɛrətɪn) or

ceratin

n
(Zoology) a fibrous protein that occurs in the outer layer of the skin and in hair, nails, feathers, hooves, etc

ker•a•tin

(ˈkɛr ə tɪn)

n.
a tough, insoluble protein that is the main constituent of hair, nails, horn, hoofs, etc., and of the outermost layer of skin.
[1840–50; < Greek kerat-, s. of kéras horn + -in1]
ker`a•tin•i•za′tion, n.
ker′a•tin•ize`, vb
ke•rat•i•nous (kəˈræt n əs) adj.

ker·a·tin

(kĕr′ə-tĭn)
A tough, fibrous protein that is the main structural component of hair, nails, horns, feathers, and hooves.
Did You Know? Nature ingeniously uses the same chemicals to perform a wide variety of functions in living things. An example is the group of closely related proteins known as the keratins. When nature wants something hard and tough for an animal, it turns to keratins. Your nails and hair are made mostly of a kind of keratin, and so are a dog's claws, a bird's beak, and a goat's horns. Even the hard material called baleen that some whales have in their mouths to help them eat is made of a variety of keratin. All proteins are strings of amino acids, and the keratins' secret is the amino acid known as cysteine. This amino acid tends to form strong bonds with other cysteines in the protein. The different keratins vary in hardness, depending on how many cysteine bonds are present. The bonds are what make the keratins tough as, well, nails.

keratin

A hard, waterproof protein found in the epidermis, hair, and nails.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.keratin - a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves
feather, plumage, plume - the light horny waterproof structure forming the external covering of birds
hair - a covering for the body (or parts of it) consisting of a dense growth of threadlike structures (as on the human head); helps to prevent heat loss; "he combed his hair"; "each hair consists of layers of dead keratinized cells"
horn - the material (mostly keratin) that covers the horns of ungulates and forms hooves and claws and nails
albuminoid, scleroprotein - a simple protein found in horny and cartilaginous tissues and in the lens of the eye
Translations

keratin

[ˈkɛrətɪn] ncheratina

ker·a·tin

n. queratina, proteína orgánica insoluble, elemento componente de las uñas, la piel y el cabello.

keratin

n queratina
References in periodicals archive ?
Along with soft keratin, it is responsible for skin strength and elasticity.