Noun | 1. | Crotalidae - New World vipers: pit vipers reptile family - a family of reptiles pit viper - New World vipers with hollow fangs and a heat-sensitive pit on each side of the head rattler, rattlesnake - pit viper with horny segments at the end of the tail that rattle when shaken Crotalus, genus Crotalus - large rattlesnakes; seldom bite unless startled or pursuing prey genus Sistrurus, Sistrurus - pygmy rattlesnakes Bothrops, genus Bothrops - fer-de-lance |