- viper - venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw
--1 is a kind of snake, serpent, ophidian
--1 is a member of Viperidae, family Viperidae
--1 has particulars:adder, common viper, Vipera berus; asp, asp viper, Vipera aspis; puff adder, Bitis arietans; gaboon viper, Bitis gabonica; horned viper, cerastes, sand viper, horned asp, Cerastes cornutus; pit viper