What is the technical term for a nail?

The technical term for a nail is "onyx." This term is derived from the Greek word "onyx," meaning "claw" or "fingernail," and it specifically refers to the hard, keratinized structure that covers the dorsal aspect of the fingers and toes. Nails serve several vital functions, including protection of the distal phalanx, enhancing fine touch sensations, and assisting in gripping objects.

The other terms listed can be related to different anatomical structures. For example, "clavus" refers to a corn or hardened area of skin often found on the feet, "pollex" specifically indicates the thumb, and "digit" refers to any of the fingers or toes. Thus, while these terms pertain to parts of the hand or foot, they do not accurately describe the structure and function of nails.