Etymology:
Meaning:
Keratin is a fibrous protein found in the outer layer of skin, hair, and nails. It is a tough, insoluble protein that provides structure, protection, and waterproofing.
Origin:
The word "keratin" was first used in 1848 by the German chemist Richard Wagner to describe the protein found in the horns of animals. The word is derived from the Greek word keratinos, meaning "horny," which refers to the hard, protective nature of keratin.
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