hognosesnake

Century Dictionary and Cyclopedia

1. n. A snake of the genus Heterodon, which flattens the head when about to strike. It is not venomous. Also called flathead or flat-headed adder, blowing-viper, etc. See Heterodon.

GNU Webster's 1913

1. A harmless North American snake of the genus Heterodon, esp. Heterodon platyrhynos; -- called also puffing adder, blowing adder, and sand viper.

WordNet 3.0

1. n. harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed