| NOUN | animal | pit viper | New World vipers with hollow fangs and a heat-sensitive pit on each side of the head |
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| Meaning | New World vipers with hollow fangs and a heat-sensitive pit on each side of the head. | |
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| Member of | Crotalidae, family Crotalidae | (New World vipers) pit vipers |
| Narrower | copperhead, Agkistrodon contortrix | Common coppery brown pit viper of upland eastern United States |
| fer-de-lance, Bothrops atrops | large extremely venomous pit viper of Central America and South America | |
| rattlesnake, rattler | pit viper with horny segments at the end of the tail that rattle when shaken | |
| water moccasin, cottonmouth, cottonmouth moccasin, Agkistrodon piscivorus | venomous semiaquatic snake of swamps in southern United States | |
| Broader | viper | venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw |
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