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The technical term applied to any deformity or disease of the nail is:

  1. Onychomycosis

  2. Onycholysis

  3. Onychosis

  4. Onychophagy

The correct answer is: Onychosis

Onychosis is the technical term used to describe any deformity or disease of the nail. This term includes a wide range of conditions, such as fungal infections (onychomycosis), separation of the nail from the nail bed (onycholysis), and nail biting (onychophagy). Onychosis is the most general and inclusive term, making it the most appropriate answer choice. Option A, Onychomycosis, refers specifically to a fungal infection and is therefore too narrow of a term. Option B, Onycholysis, only refers to the separation of the nail from the nail bed and does not encompass all deformities or diseases. Option D, Onychophagy, only refers to nail biting and once again is not a broad enough term to encompass all nail issues. Therefore, the best and most accurate answer is C, Onychosis.