Dictionary of Difficult Words - reductio ad absurdum
reductio ad absurdum
n.n. 'reduction to absurdity'; proving a proposition by showing that its opposite is absurd; disproving a proposition by deducing from it an absurd conclusion; such conclusion.
The points of the star represent the first seven verses of the Koran. Red, black, white, and green became the pan-Arab colours. Effective date: 16 April 1928.