/ Dictionary / Index R rectifier: Meaning and Definition of Find definitions for: rec•ti•fi•er Pronunciation: (rek'tu-fī"ur), [key] — n. a person or thing that rectifies. an apparatus in which current flows more readily in one direction than the other, for changing an alternating current into a direct current. the apparatus that in distillation separates the most volatile material by condensing it; condenser. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: rectifier (Thesaurus) rectification rectify Related Content Daily Word Quiz: placid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language