a former county of N England around the Humber estuary, formed in 1974 from parts of the East and West Ridings of Yorkshire and N Lincolnshire: replaced in 1996 by the unitary authorities of East Riding of Yorkshire, Kingston upon Hull, North Lincolnshire, and North East Lincolnshire
Humberside in American English
(ˈhʌmbərˌsaɪd)
county in NE England, on the Humber estuary & the North Sea: 1,354 sq mi (3,507 sq km); pop. 858,000