| Noun | 1. | genus Heterodon - a genus of small colubrid snakes containing the North American hognose snakesreptile genus - a genus of reptiles Colubridae, family Colubridae - nonvenomous snakes; about two-thirds of all living species hognose snake, puff adder, sand viper - harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed |