1. of, relating to, or composed of keratin; having the nature or properties of keratin
Usage: technical/scientific; commonly used in biology and dermatology

Examples

• The keratinous layer of skin provides a protective barrier against infection.
• Fingernails are composed of keratinous material that grows continuously.
• Birds have keratinous beaks and claws adapted for their specific diets.
• The keratinous scales of reptiles help reduce water loss in dry environments.
• Hair is a keratinous structure that grows from follicles in the skin.