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
- pit viper New World vipers with hollow fangs and a heat-sensitive pit on each side of the head
- gaboon viper large heavy-bodied brilliantly marked and extremely venomous west African viper
- aspis horned vipers
- sand viper highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
- genus vipera type genus of the Viperidae
- crotalidae New World vipers: pit vipers