What term refers to any deformity or disease of the natural nail?

The term that refers to any deformity or disease of the natural nail is onychosis. This term is a broad classification that encompasses various nail disorders, including changes in nail color, shape, or texture, along with any conditions that may affect the nail's overall health. Understanding onychosis is essential for nail technicians because it helps them identify and address any abnormalities in clients' nails, ensuring appropriate care and treatment recommendations.

Other terms listed, such as onychophagy, specifically describe nail biting, which is a habit rather than a condition. Onychorrhexis refers specifically to abnormal brittle nails characterized by ridges or splits, while paronychia is an infection of the tissue surrounding the nail. While all these terms pertain to the nails, they are more specific conditions rather than the overarching term that encompasses any deformity or disease of the natural nail.