D defs.my
Entry 2 senses Webster, 1913

Copperhead

/käp'-ẽrh-ĕdˌ/ · Cop·per·head · IPA /kˈɑpərhˌɛd/
01 n. A poisonous American serpent (Ancistrodon conotortrix), closely allied to the rattlesnake, but without rattles; -- called also copper-belly…
  1. 1.
    A poisonous American serpent (Ancistrodon conotortrix), closely allied to the rattlesnake, but without rattles; -- called also copper-belly, and red viper.(Zool.) Also: copper-belly, red viper
  2. 2.
    A nickname applied to a person in the Northern States who sympathized with the South during the Civil War.[U.S.]