Copperhead /(?)/

Cop·per·head

Copperhead

n.
  1. A poisonous American serpent (Ancistrodon conotortrix), closely allied to the rattlesnake, but without rattles; -- called also copper-belly, and red viper. (Zool.)
  2. A nickname applied to a person in the Northern States who sympathized with the South during the Civil War. [U.S.]