barrio

neighbourhood; any neighbourhood of the original or ancient part of a city (usually excluding new growth after the 1930s, 40s or 50s, depending on the state or city); slum

“un barrio de clase media” — a middle-class neighborhood

Borrowed from Andalusian Arabic بَرِّيّ (barriyy, “exterior”), referring to the outer, surrounding or less civilized or urbanized parts of a city, from classical Arabic بَرِّيّ (barriyy, “wild”). Compare Portuguese bairro, Catalan barri.