the world > animals > mammals > group Ungulata (hoofed) > order Artiodactyla (cloven-hoofed animals) > pig > 			[noun]		 > defined by parts (16)		
A lean pig with the backbone forming a prominent narrow ridge along the back; esp. (U.S.) a member of a half-wild breed of pigs common in the…
U.S. A razorback pig; = razorback, n. 1c. Now historical.