What does keratinization mean?
Keratinization is the biological process in which keratin is formed or cells become filled with keratin and develop into hard, protective tissue. It is especially important in the epidermis, where it contributes to the skin's resistance to friction, microorganisms, water loss, and environmental stress. Hair and nails are also composed largely of keratin, and the process is fundamental to their structure. In medicine, the term can describe either normal maturation of epidermal cells or an abnormal increase in keratin production, as in certain skin disorders. Because keratinization is a process rather than a single substance, the word is normally treated as a mass noun and is most often seen in scientific or clinical writing. It is related to the broader medical term cornification, which emphasizes the conversion of cells into a horny, keratinized layer.
nounThe process of forming keratin or converting cells into keratin, especially through the development of a protective, horny layer in the epidermis.
- The biological process of producing keratin or converting cells into a keratinized, horny tissue.
"The biopsy showed abnormal keratinization in the affected skin."
"Keratinization of the epidermis creates a protective barrier against environmental damage."
"The disorder is characterized by excessive keratinization of the skin."
The plural is rare; the noun is normally used in the singular or as an uncountable process.
"The study compared keratinizations in healthy and diseased tissues."
Your skin's protective outer layer is continually renewed through keratinization, the process that turns cells into tough keratin.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does keratinization come from?
Keratinization was formed in English from keratin and the suffix -ization, meaning the formation or process of conversion. Keratin was coined in the 19th century from Greek keras, meaning “horn,” combined with the chemical suffix -in. The same Greek root also underlies related terms such as keratocyte, keratoderma, and keratosis.
Related word forms
How keratinization is actually used
This is primarily a technical term used in biology, histology, and medicine. In clinical contexts it may refer to normal keratinization or to an abnormal or excessive process.