Examples of “keratin” in a Sentence

noun A tough, fibrous protein that forms the main structural material of hair, nails and the outer layer of skin, and of horns, hooves and feathers in animals. Its strands pack together tightly, which is what makes these tissues hard and water-resistant.

• Nails are made largely of keratin.
• The biologist explained that a rhino's horn is keratin, the same protein as fingernails.

noun A hair treatment named after this protein, in which a product is applied and sealed with heat to make hair smoother and straighter for a period of weeks.

• She booked a keratin at the salon before the wedding.