ˌləmbrəˈkālə̇s noun
( plural lumbrica·les -ˌlēz)
Etymology: New Latin, from lumbricalis lumbrical
: one of the four small muscles in the palm of the hand that arises from and is accessory to one of the deep flexor tendons and is inserted at the base of the digit to which the tendon passes ; also : one of four similar muscles in the sole of the foot