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Noun: adder  a-du(r)
  1. A person who adds numbers
  2. A machine that adds numbers
  3. Small terrestrial viper common in northern Eurasia
    - common viper, Vipera berus

Derived forms: adders

Type of: calculating machine, calculator, computer, estimator, figurer, reckoner, viper

Part of: genus Vipera, Vipera

Encyclopedia: Adder