ab absurdo

ab absurdo From the absurd. When a person argues ab absurdo, he/she is trying to establish the validity of her/his position by pointing out the ridiculousness (absurdity) or foolishness of the opponent`s arguments. Although an argument ab absurdo may `demolish” an opponent`s position in debate, it does not necessarily prove the validity of that...
Found on http://www.wordinfo.info/words/index/info/view_unit/2357/
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