adder

ad·der

noun \ˈad-ər\

Definition of ADDER

1

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

Illustration of ADDER