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
- viperidae Old World vipers
- genus bitis a genus of Viperidae
- bitis arietans large African viper that inflates its body when alarmed
- horned viper highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- sand viper highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- family viperidae Old World vipers