/ Dictionary / Index B ballast resistor: Meaning and Definition of Find definitions for: bal'last resis"tor Pronunciation: [key] ballast (def. 5a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ballast pocket ballata Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language