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Definition of Perionychium
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Perionychium: The tissue surrounding the nail, whether it be a fingernail or a toenail, including the tissue bordering the root and sides of the nail.
The word is composed of "peri-" meaning around or surrounding + the Greek word "onyx" for nail = around the nail.