The prefix brachi means which of the following?

• A. Arm
• B. Eye lid
• C. Life
• D. Hear

Answer: (A)

Prefixes in medical terms often indicate a body part involved, and brachi- designates the arm. That’s why it fits best: you’ll see this prefix in terms like brachial artery or brachium, which are specifically related to the arm. The other options point to different parts or senses: eyelid is linked to blepharo- or blepharon; life is shown with bio- or bi-; and hearing uses oto- or acoustic-. So brachi- reliably signals the arm.