supinator

/ˈsuːpɪneɪtər/
noun
  1. A muscle in the forearm that turns the palm upward or forward.
    • The supinator helps rotate your forearm when you turn a doorknob.
    • Injuries to the supinator can make it hard to twist your wrist.
    • Physical therapy exercises can strengthen the supinator muscle.
  2. A person or thing that supinates, especially a device or tool used to turn the palm upward.
    • The robot's arm has a built-in supinator for precise movements.
    • A good supinator is essential for certain rehabilitation routines.
    • The therapist used a supinator to help the patient regain wrist motion.
Antonyms