The Collaborative International Dictionary of English v.0.48:
Razor-backed \Ra"zor-backed"\ (-b[a^]kt`), a. (Zool.) Having a sharp, lean, or thin back; as, a razor-backed hog, perch, etc. [1913 Webster]WordNet (r) 3.0 (2006):
razor-backed adj 1: having a sharp narrow back; "a razor-backed horse"; "razorback hogs" [syn: razorback, razor-backed]