pit viper
noun
Definitions
Any of various venomous snakes, of the subfamily Crotalinae, found in Asia and the Americas, with a deep pit or fossa on either side of the head that enables them to detect prey by infrared.
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Definitions
Any of various venomous snakes, of the subfamily Crotalinae, found in Asia and the Americas, with a deep pit or fossa on either side of the head that enables them to detect prey by infrared.