Which combining form means nerve?

• A. Neur/o
• B. Myel
• C. Enter/o
• D. Tonsill/o

Answer: (A)

The main idea is identifying the combining form that means nerve. neur/o is the form that literally denotes nerve, and it appears in terms like neuropathy (nerve disease) or neuritis (nerve inflammation). The other forms point to different parts: myel- relates to the spinal cord (and sometimes bone marrow in other contexts), enter- to the intestine, and tonsill- to the tonsil. So neur/o is the correct choice because it directly represents nerve.