1. (noun) venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw

• adder
• common viper
• vipera berus
• asp
• asp viper
• vipera aspis
• bitis arietans
• puff adder
• bitis gabonica
• gaboon viper
• cerastes
• cerastes cornutus
• horned asp
• horned viper
• sand viper
• pit viper

1. (noun) venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw

• family viperidae
• viperidae

1. (noun) venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw

• ophidian
• serpent
• snake