What does the word adder mean?

Usage examples for adder

  1. Saxham started as though an adder had flashed its fangs through his boot. – The Dop Doctor by Clotilde Inez Mary Graves
  2. He darted aside to catch up a branch, and then ran in and struck boldly at the adder, which reared hissing to meet him. – Into the Primitive by Robert Ames Bennet
  3. And rather thoughtfully she disengaged herself from the sheltering arm of that all too sympathetic young man, and went forward, shivering a little as the hiss of the enraged adder broke out from the uncongenial mud where he had unwillingly landed. – The Firing Line by Robert W. Chambers