—adj. of or relating to ancient Northumbria (England north of the Humber) or modern Northumberland.
—n.
1 a native of ancient Northumbria or modern Northumberland.
2 the dialect of ancient Northumbria or modern Northumberland.
Etymology: obs. Northumber, persons living beyond the Humber, f. OE Northhymbre
Useful english dictionary. 2012.