Agkistrodon contortrix, a venomous pit viper species found in parts of North America. / Deinagkistrodon acutus, the Chinese copperhead, a venomous pit viper species found in Southeast Asia

plural of copperhead

(US, historical) The state of being a Copperhead; sympathy in the North for Southern secessionists during the American Civil War.

(US, historical, slang) A northerner who sympathized with the South or wanted to end hostilities during the American Civil War. / (US, historical, derogatory) Any member of the Democratic party.

plural of Copperhead