apagoge

from The Collaborative International Dictionary of English v.0.48
Apagoge \Ap`a*go"ge\, n. [Gr. ? a leading away, fr. ? to lead
   away; ? from + ? to lead.] (Logic)
   An indirect argument which proves a thing by showing the
   impossibility or absurdity of the contrary.
   [1913 Webster] Apagogic
    

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