erethizon

from The Century Dictionary.

• noun A genus of porcupines, of the family Hystricidæ, having a stout form, short spines overlaid by hair, a short, thick, blunt, and flattened tail, non-prehensile, the toes four in front and five behind, all armed with strong curved claws, and the habits arboreal and terrestrial.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a genus of Erethizontidae