hognosesnake

from The Century Dictionary.

• noun 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.

from the GNU version of the Collaborative International Dictionary of English.

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

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

• noun harmless North American snake with upturned nose; may spread its head and neck or play dead when disturbed