1. A cell that produces keratin and forms the main structural component of the epidermis (outer layer of skin).
Usage: technical; biology/medicine

Examples

• Keratinocytes make up approximately 90% of the cells in the epidermis.
• The sun's UV rays can damage keratinocytes and increase the risk of skin cancer.
• Keratinocytes produce keratin, a tough protein that protects the skin.
• When keratinocytes are damaged, the skin's barrier function is compromised.
• Dermatologists study keratinocytes to understand how skin heals after injury.