/ Dictionary / Index G giant powder: Meaning and Definition of Find definitions for: gi'ant pow'der Pronunciation: [key] dynamite composed of nitroglycerin and kieselguhr. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. giant petrel giant puffball Related Content Daily Word Quiz: effervescent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language