SG Heritage Dictionary

Apagoge [\N] Webster's Dictionary 1828

1. AP'AGOGE ,

2. APAGOG'ICAL, adjective An apagogical demonstration is an indirect way of proof, by showing the absurdity or impossibility of the contrary.

Apagoge [Noun] Webster's Dictionary 1913

An indirect argument which proves a thing by showing the impossibility or absurdity of the contrary.