Adder

Any of several venomous snakes of the viper family, Viperidae, and the death adder, a viperlike member of the cobra snake family, Elapidae. The name adder may also be applied to certain other snakes, such as the hognose snake (q.v.), a harmless North American species. Among the adders of the viper family are included the common adder (Vipera berus), the puff adders (several species