a wall of defense for the Roman province of Britain, constructed by Hadrian between Solway Firth and the mouth of the Tyne.
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British Dictionary definitions for hadrian's wall
a fortified Roman wall, of which substantial parts remain, extending across N England from the Solway Firth in the west to the mouth of the River Tyne in the east. It was built in 120–123 ad on the orders of the emperor Hadrian as a defence against the N British tribes
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012