Dictionary.net

An oaken sapling or cudgel; any cudgel; - so called from Shillelagh, a place in Ireland of that name famous for its oaks.

An oaken sapling or cudgel; any cudgel; - so called from Shillelagh, a place in Ireland of that name famous for its oaks.

An oaken cudgel (from the Irish forest of Shillelah).