razorback

(noun) a mongrel hog with a thin body and long legs and a ridged back; a wild or semi-wild descendant of improved breeds; found chiefly in the southeastern United States. Synonyms: razorback hog, razorbacked hog.

(noun) any of several baleen whales of the family Balaenopteridae having longitudinal grooves on the throat and a small pointed dorsal fin. Synonyms: rorqual.

(adj) having a sharp narrow back. Synonyms: razor-backed. Examples: "A razor-backed horse." "Razorback hogs."