apagogyn.
/ˈapəɡəʊdʒi/ rare. Apparently only attested in dictionaries or glossaries.
Used as another form of apagoge n., though, having the abstract ending -y suffix3, it ought strictly to be: The use or practice of apagogical reasoning.
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the mind > mental capacity > philosophy > logic > logical syllogism > logical argument > [noun] > types of logical argument > reduction to absurdity
reductio ad impossibile1552
reduction to the absurd (also to absurdity)1712
apagogea1753
apagogy1847
1847 in J. Craig New Universal Dict.
This entry has not yet been fully updated (first published 1885; most recently modified version published online June 2021).
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n.1847