What does the root "brachi/o" refer to in medical terminology?

The root "brachi/o" in medical terminology specifically refers to the arm. This term is derived from the Latin word "brachium," meaning "arm." It is commonly used in various medical terms to describe conditions, anatomy, or procedures associated with the arm, such as brachial plexus (the network of nerves that send signals from the spine to the shoulder, arm, and hand) and brachitis (inflammation of the arm). Understanding this root helps in interpreting medical terminology accurately related to the upper limb.