The Collaborative International Dictionary of English v.0.48:
Backband \Back"band`\ (b[a^]k"b[a^]nd), n. [2nd back, n. + band.] (Saddlery) The band which passes over the back of a horse and holds up the shafts of a carriage. [1913 Webster]WordNet (r) 3.0 (2006):
backband n 1: a broad band that passes over the back of a horse and supports the shafts of a vehicle