re·duc·ti·o ad ab·sur·dum
noun/rɪˌdʌktiəʊ æd æbˈsɜːdəm/
/rɪˌdʌktiəʊ æd æbˈsɜːrdəm/
[uncountable, countable] (from Latin, philosophy)- a method of proving that something is not true by showing that its result is not logical or sensible
归谬法 Word OriginLatin, literally ‘reduction to the absurd’.