1. to convert into or become keratin; to undergo or cause to undergo the formation of keratin (a tough, fibrous protein)
Usage: biology, medicine; often used in passive voice or reflexive form

Examples

• The outer layer of skin keratinizes to form a protective barrier.
• Hair and nails keratinize as they grow.
• Epithelial cells keratinize during the normal development of the epidermis.
• The tissue began to keratinize after exposure to repeated friction.
• Keratinized cells provide structural support and protection in many tissues.