Adverbial horseback has 1 sense
  1. horseback, ahorse, ahorseback - on the back of a horse; "he rode horseback to town"; "managed to escape ahorse"; "policeman patrolled the streets ahorseback"
,Noun horseback has 2 senses
  1. horseback - the back of a horse
    --1 is a kind of
    body part
    --1 is a part of horse, Equus caballus
  2. hogback, horseback - a narrow ridge of hills
    --2 is a kind of ridge
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