Definition that contains viper
- rattlesnake pit viper with horny segments at the end of the tail that rattle when shaken
- adder small terrestrial viper common in northern Eurasia
- rattler pit viper with horny segments at the end of the tail that rattle when shaken
- copperhead common coppery brown pit viper of upland eastern United States
- cerastes highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- horned asp highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- family crotalidae New World vipers: pit vipers
- sand viper highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- cerastes cornutus highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- genus bitis a genus of Viperidae