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
- aspis horned vipers
- genus vipera type genus of the Viperidae
- bothrops atrops large extremely venomous pit viper of Central America and South America
- crotalidae New World vipers: pit vipers
- puff adder large African viper that inflates its body when alarmed
- vipera berus small terrestrial viper common in northern Eurasia