/ Dictionary / Index S sounding balloon: Meaning and Definition of Find definitions for: sound'ing balloon" Pronunciation: [key] — Meteorol. Meteorol. a balloon carrying instruments aloft to make atmospheric measurements, esp. a radiosonde balloon. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sounding sounding board Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language