Main Entry: ad·der

Pronunciation: \ˈad-ər\

Function: noun

1 : the common venomous European viper of the genus Vipera (V. berus)

[adder illustration]

; broadly : a terrestrial viper of the family Viperidae
2 : any of several North American snakes (as the hognose snakes) that are harmless but are popularly believed to be venomous