Definitions:

1. A biological and medical term that describes natural or pathological anatomical structures made of a hard layer of protein. ADJECTIVE
   • The corneous bill of the toucan is brightly colored and plays a role in courtship displays.
2. Describes something as having the nature or characteristic of horn, or resembling horn in texture and appearance. ADJECTIVE
   • The corneous claws of the bear are formidable weapons used for hunting and self-defense.

Synonyms:

• bony
• dense
• hornlike
• horny
• osseous