2. Adjective. Having a saddle-shaped marking; saddleback. ¹
3. Adverb. (context: of riding a horse) with a saddle, rather than bare-backed ¹
¹ Source: wiktionary.com
Medical Definition of Saddle-backed
1. 1. Having the outline of the upper part concave like the seat of a saddle. 2. Having a low back and high neck, as a horse. Source: Websters Dictionary (01 Mar 1998)