Any of numerous venomous snakes of household Crotalidae, such as for instance a copperhead, rattlesnake, or fer-de-lance, characterized by a small sensory pit below each attention.
any one of different venomous snakes, associated with the household Crotalinae, found in Asia and also the Americas, with a-deep pit or fossa on either side of the head that enables all of them to detect prey by infrared.
any viperine snake having a deep gap for each side of the snout. The rattlesnake and copperhead are examples.
A venomous serpent associated with family Crotalidæ, as a rattlesnake; a pit-headed viper: so named from characteristic gap amongst the eyes and nostrils. See Bothrophera.
New World vipers with hollow fangs and a heat-sensitive pit for each region of the mind