Hypertext Webster Gateway: "apagogical"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Apagogic \Ap`a*gog"ic\, Apagogical \Ap`a*gog"ic*al\, a.
Proving indirectly, by showing the absurdity, or
impossibility of the contrary. --Bp. Berkeley.
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