horseback

horseback is defined in Webster's Unabridged Dictionary (1913) with 1 sense. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.An extended ridge of sand, gravel, and bowlders, 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.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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