Definition of "backsplit"

By the 1960s in North America sprawling ranchers and backsplits with attached garages had become common […]

1987, E. C. Relph, The Modern Urban Landscape: 1880 to the Present, page 174

As for the tornado-struck house, a semi-detached backsplit, it was in need of significant repairs, and the Cammisas said their insurance company told them not to expect a speedy visit from the adjuster.

2009 August 22, Dave Feschuk, “First a tornado's swirl; then, a whirl of logistics”, in Toronto Star‎