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Reductio ad Absurdum

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A proof of inference arising from the demonstration that every other hypothesis involves an absurdity. Thus, suppose I want to prove that the direct road from two given places is the shortest, I should say, “It must either be the shortest or not the shortest. If not the shortest, then some other road is the direct road; but there cannot be two shortest roads, therefore the direct road must be the shortest.”

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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.

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Red Tapism
Red Tincture
Redan
Redder (The)
Redding-straik (A)
Redgauntlet
Redgauntlet
Redlaw (Mr)
Redmain
Redmond ONeale
Reductio ad Absurdum
Reduplicated or Ricochet Words
Ree
Reed
Reed Shaken by the Wind (A)
Reef
Reekie (Auld)
Reel
Reel
Reeves Tale
Refresher