/ Dictionary / Index V varactor: Meaning and Definition of Find definitions for: va•rac•tor Pronunciation: (vu-rak'tur), [key] — n. a semiconductor diode whose capacitance changes to match applied voltage, used to tune circuits by varying the reactance. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. vara Varanasi 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