What is the technical term for "nails"?

The term "onyx" is derived from the Greek word for "nail," and in a technical context, it specifically refers to the structure of the nail itself. It encompasses the hard, keratinized material that forms the visible part of the nail, as well as its underlying structures. This term is used in various aspects of nail care and study, making it the accurate choice for the technical term representing "nails."

The other choices refer to specific conditions or terms related to nails but do not serve as the general term for nails. Agnails refer to hangnails, which are small pieces of skin that can be painful. Onychauxis describes a condition where there is thickening of the nails, and onychophagy is the medical term for nail-biting. Each of these relates to nail conditions rather than serving as a classification or term for nails themselves.