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Noun adder has 3 senses
  1. adder - a person who adds numbers
    --1 is a kind of
    calculator, reckoner, figurer, estimator, computer
  2. adder - a machine that adds numbers
    --2 is a kind of
    calculator, calculating machine
    Derived forms: verb add5, verb add4
  3. adder, common viper, Vipera berus - small terrestrial viper common in northern Eurasia
    --3 is a kind of viper
    --3 is a member of Vipera, genus Vipera
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