a metropolitan county of NW England, administered since 1986 by the unitary authorities of Sefton, Liverpool, St Helens, Knowsley, and Wirral. Area: 652 sq km (252 sq miles)
Merseyside in American English
(Mɛrsɛjˌsaɪd)
county in NW England, on the Mersey & the Irish Sea: 253 sq mi (655 sq km); pop. 1,404,000