/ Dictionary / Index R reductio ad absurdum: Meaning and Definition of Find definitions for: re•duc•ti•o ad ab•sur•dum Pronunciation: (ri-duk'tē-ō" ad' ab-sûr'dum, -zûr'-, -shē-ō"), [key] — Logic. Logic. a reduction to an absurdity; the refutation of a proposition by demonstrating the inevitably absurd conclusion to which it would logically lead. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. reductase test reduction Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language