/ Dictionary / Index G giant puffball: Meaning and Definition of Find definitions for: gi'ant puff'ball Pronunciation: [key] a puffball, Calvatia gigantea, that is the largest of its kind, known to have grown to more than 5 ft. (1.6 m) in circumference. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. giant powder giant ragweed Related Content Daily Word Quiz: divulge Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language