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viper

noun

  1. any of a widespread family (Viperidae) of venomous snakes, including the pit vipers, the European adder, and the African puff adder; solenoglyph
  2. any of various other poisonous or supposedly poisonous snakes
    1. a malicious or spiteful person
    2. a treacherous person

See viper in American Heritage Dictionary 4

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