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Any deformity or disease of the natural nail is referred to as:

  1. Onychocryptosis

  2. Onycholysis

  3. Onychomycosis

  4. Onychosis

The correct answer is: Onychocryptosis

The correct term for any deformity or disease of the natural nail is "Onychosis." This term encompasses a broad range of nail disorders, including those caused by infection, trauma, or other underlying health issues, which affect the appearance and structure of the natural nail. Onychocryptosis specifically refers to ingrown nails, while onycholysis indicates the separation of the nail from its bed, usually as a result of trauma or infection. Onychomycosis pertains specifically to nail fungal infections. These terms are more specific to particular conditions rather than describing any deformity or disease of the nail as a whole.