/ Dictionary / Index S sounding rocket: Meaning and Definition of Find definitions for: sound'ing rock"et Pronunciation: [key] a rocket equipped with instruments for making meteorological observations in the upper atmosphere. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sounding machine sound law 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