Source : Webster's Revised Unabridged Dictionary (1913)

Barebacked \Bare"backed`\, a.
   Having the back uncovered; as, a barebacked horse.

Source : WordNet®

barebacked
     adj : riding without a saddle; "a bareback rider" [syn: {bareback}]
     adv : without a saddle; "she prefers to ride her horse bareback"
           [syn: {bareback}]