From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. An extended ridge of sand, gravel, and boulders, in a half-stratified condition. --Agassiz.
{On horseback}, on the back of a horse; mounted or riding on a horse or horses; in the saddle.
The long journey was to be performed on horseback. --Prescott.
From WordNet (r) 2.0 [wn]:
noun
2: a narrow ridge of hills [syn: {hogback}]
adverb
1: on the back of a horse; "he rode horseback to town"; "managed to escape ahorse"; "policeman patrolled the streets ahorseback" [syn: {ahorse}, {ahorseback}]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
20 Moby Thesaurus words for "horseback": across, astraddle, astride, by horse, chine, col, comb, esker, hogback, kame, mounted, on, on horseback, ridge, saddle, saddleback, spine, straddle, straddle-legged, straddleback
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