The Etymology of Copperhead
Copperhead is a transparent American English compound, first attested around 1775, naming the pit viper Agkistrodon contortrix for its distinctive coppery-bronze head. The compound is straightforward — copper (the metal) plus head — and follows a common English pattern of naming animals for a colour or feature (redhead, blackbird, bullfrog). The metal itself is named for Cyprus: Latin cuprum is short for aes Cyprium, the metal of Cyprus, where Roman copper-mining was concentrated. So if you trace the etymology far enough, a copperhead is, distantly, a head of Cyprus. The other Copperhead — capitalised — is a piece of American Civil War political history. In 1861, Republican newspapers began calling antiwar northern Democrats Copperheads, comparing them to the snake that strikes without rattling. The label stuck through the war and remains a piece of American political vocabulary, alongside Carpetbagger and Scalawag. The snake itself is responsible for many bites in the eastern United States but rarely fatal ones — copperhead venom is potent but the dose is small.