/ Dictionary / Index A arc-back: Meaning and Definition of Find definitions for: arc-back Pronunciation: (ärk'bak"), [key] — n. Electronics. an undesirable phenomenon, occurring in rectifier tubes, in which current flows in the reverse direction, from anode to cathode, as a result of arcing, limiting the usable voltage of the tube. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. arcature arc-boutant* Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language