English Dictionary

pit adder

noun

Any of various venomous snakes of the family Crotalinae, found in Asia and the Americas, with a deep pit or groove on either side of the head which enables them to detect prey by infrared sensing; a pit viper.

The pit adder is a venomous snake found in the desert.

意味（1）

Any of various venomous snakes of the family Crotalinae, found in Asia and the Americas, with a deep pit or groove on either side of the head which enables them to detect prey by infrared sensing; a pit viper.

The two chief poisonous families of the rest of the globe, the vipers (Viperidae) and the pit-adders (Crotalida;), are entirely absent, their place being supplied by the Elapidae, …