brachioradial muscle bra·chi·o·ra·di·al muscle (brā'kē-ō-rā'dē-əl, brāk'ē-)
n.
A muscle with its origin in the lateral supracondylar ridge of the humerus, with insertion to the front of the base of the styloid process of the radius, with nerve supply from the radial nerve, and whose action flexes the forearm.