A snake of the genus Acanthophis, a group of highly venomous elapids found in Australia and New Guinea. / The copperhead, a venomous pit viper species Agkistrodon contortrix, found in North America.

plural of adder fly

plural of adder's-tongue

Alternative form of puffadder

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.

plural of pit adder

Alternative form of pit adder

plural of sea adder

The European fifteen-spined stickleback (Spinachia spinachia, syn. Gasterosteus spinachia). / The tanglefish, or greater pipefish (Syngnathus acus).

plural of death adder