BELTWAY
beltway, bypass, ring road, ringway
(noun) a highway that encircles an urban area so that traffic does not have to pass through the center
Source: WordNet® 3.1
Etymology
Noun
beltway (plural beltways)
(US) A freeway that encircles a city.
Synonyms
• ring road (chiefly Australia)
Etymology
Proper noun
Beltway
A 64-mile Interstate freeway surrounding Washington, D.C..
(mostly local usage) The expressway that surrounds another city.
(US politics) The US federal government and policy and lobbying organizations, located in Washington, D.C..
Adjective
Beltway (comparative more Beltway, superlative most Beltway)
Of or relating to the culture of Washington, D.C.; politicized.
Source: Wiktionary