Gnawing = mouse.
1) An Edomitish king (Gen. 36:38; 1 Chr. 1:49).
2) One of Josiah's officers sent to the prophetess Huldah to inquire regarding the newly-discovered book of the law (2 Kings 22:12, 14). He is also called Abdon (2 Chr. 34:20).
Easton's Bible Dictionary. M.G. Easton. 1897.