Abone which has atubercle where a tendon attaches to the inner and back part of it.
1845, Edward Smedley, Hugh James Rose, Henry John Rose,Encyclopaedia Metropolitana: Difform- Falter,page426:
The tendon itself dips down between the flexors of the hand and fingers and the supinators of the fore arm, and is - inserted at the inner and back part of the tubercle of thespoke-bone.
