Made of or resembling horn in hardness, texture, or appearance; horn-like.
From Latin 'corneus' meaning horn-like, directly derived from 'cornu' (horn). This adjective has been used in English since at least the 17th century for describing horn-like substances.
When you describe something as corneous, you're comparing it to horn—and since horns are what keep animals safe, anything corneous is basically nature's armor!
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