adder(redirected from Adder (disambiguation))
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Common name for many members of the family Viperidae (the vipers), applied to several genera, although true adders are of the genus Vipera.
[M.E. naddre, fr. O.E. nāedre]
1. Any of several venomous snakes, especially a viper of the subfamily Viperinae.
2. Any of several nonvenomous snakes, such as the hognose snake, often believed to be harmful.