- ☆ copperhead [käp′ər hed΄ ]n.1. a poisonous North American pit viper (Agkistrodon contortrix) with a copper-colored head and dark-brown cross bands2. [C-] [Old Informal] Informal former a Northerner who sympathized with the South at the time of the Civil War: so called in the North
English World dictionary. V. Neufeldt. 2014.