What does the word viper mean?

Usage examples for viper

  1. I have found many a viper, and I am familiar with their aspect. – Old Fritz and the New Era by Louise Muhlbach
  2. Alone and undisturbed the bleached viper warmed to its dance with the pulsing flame, turning and twisting, weaving and writhing in its infernal glare.... – The Bronze Bell by Louis Joseph Vance
  3. The viper of the Nile had betrayed him. – Historia Amoris: A History of Love, Ancient and Modern by Edgar Saltus