Having a curved spine.

(mineralogy) A saddle reef: a saddle-shaped bedded mineral vein in the form of an anticline or a syncline (an inverted saddle).

plural of saddle back reef

far post

Alternative form of wingback

(zoology) Having a sharp, lean, or thin back.

(idiomatic, Australia, US, euphemistic) Of an item of merchandise, to come into a person's possession through illegal or otherwise dubious means.

(transitive) To keep at a distance

(of a horse) Having a convex back rather than a concave one.

plural of back house