belt·way 
/ˈbɛltˌweɪ/ noun
plural belt·ways /ˈbɛltˌweɪ/ noun 1 [count] US : a highway that goes around a city
▪ an urban beltway —called also (Brit) orbital 2 the Beltway : the political and social world of Washington, D.C.
▪ politics inside the Beltway ▪ Her influence extends beyond the Beltway.
▪ an urban beltway —called also (Brit) orbital
▪ politics inside the Beltway ▪ Her influence extends beyond the Beltway.
— Beltway adjective always used before a noun
▪ Beltway politicians/politics [=the politicians/politics of Washington, D.C.]
▪ Beltway politicians/politics [=the politicians/politics of Washington, D.C.]
