What does the word copperhead mean?

Usage examples for copperhead

  1. General Tuttle ran for governor on the Copperhead ticket in Iowa last year. – A Woman's Life-Work Labors and Experiences by Laura S. Haviland
  2. A copperhead snake was killed here about the same date; caterpillars did not seem to retire, as they usually do, but came forth every warm day. – A Year in the Fields by John Burroughs