/ Dictionary / Index H HVDC: Meaning and Definition of Find definitions for: HVDC Pronunciation: [key] high-voltage direct current. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. HVAC HVP Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language