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Noun: reductio ad absurdum  ree`dúk-ti-ow-ad ab'zur-dum
  1. (reduction to the absurd) a disproof by showing that the consequences of the proposition are absurd; or a proof of a proposition by showing that its negation leads to a contradiction
    - reductio

Type of: disproof, falsification, refutation

Encyclopedia: Reductio ad absurdum