Source : Webster's Revised Unabridged Dictionary (1913)

Razor-backed \Ra"zor-backed"\, a. (Zo["o]l.)
   Having a sharp, lean, or thin back; as, a razor-backed hog,
   perch, etc.

Source : WordNet®

razor-backed
     adj : having a sharp narrow back; "a razor-backed horse";
           "razorback hogs" [syn: {razorback}]