What is the meaning of Death_adder?

Any snake of the genus Acanthophis, a group of highly venomous elapids found in Australia and New Guinea.

A copperhead, a venomous pit viper species Agkistrodon contortrix, found in North America.

An eastern hognose snake, Heterodon platirhinos, a non-venomous colubrid species found in North America.

Source: wiktionary.org