The Collaborative International Dictionary of English v.0.48:

Wart hog \Wart" hog`\ (Zool.)
   Either one of two species of large, savage African wild hogs
   of the genus Phacoch[oe]rus. These animals have a pair of
   large, rough, fleshy tubercles behind the tusks and second
   pair behind the eyes. The tusks are large and strong, and
   both pairs curve upward. The body is scantily covered with
   bristles, but there is long dorsal mane. The South African
   species (Phacoch[oe]rus Aethiopicus) is the best known.
   Called also vlacke vark. The second species
   (Phacoch[oe]rus Aeliani) is native of the coasts of the Red
   Sea.
   [1913 Webster]