/ Dictionary / Index G grass sponge: Meaning and Definition of Find definitions for: grass' sponge" Pronunciation: [key] a large, dark brown, commercial sponge, Spongia graminea, of Florida, the West Indies, and the Gulf of Mexico. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. grass sorghum grass style Related Content Daily Word Quiz: labyrinth Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language