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noun
New World vipers with hollow fangs and a heat-sensitive pit on each side of the head.
is a specific kind of: viper.
is a broader term that covers: Agkistrodon contortrix, copperhead | Agkistrodon piscivorus, cottonmouth, cottonmouth moccasin, water moccasin | rattler, rattlesnake | Bothrops atrops, fer-de-lance.
is a member of: Crotalidae, family Crotalidae.
Find more on pit viper elsewhere: etymology - rhymes - Wikipedia.
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