lumbrical
/ˈlʌmbrɪkəl/
noun
- Any of four small muscles in the hand that help bend the fingers at the knuckles and straighten them at the other joints.
- The lumbricals work with other hand muscles to allow fine finger movements.
- Pianists rely on strong lumbricals for quick and precise finger motions.
- An injury to a lumbrical can make it hard to grip objects tightly.