Definitions

1. noun

a type of structural protein found in the outer layer of skin, hair, and nails

“Keratin is a key component of hair, and its structure is responsible for its strength and elasticity.”

2. noun

a type of protein found in the horns, hooves, and claws of animals

“Keratin is a major component of the horns of cattle and other livestock.”

3. noun

a type of fibrous protein found in the skin of animals, especially sheep

“Keratin is used to make wool and other textiles.”