/ Dictionary / Index G guinea grass: Meaning and Definition of Find definitions for: guin'ea grass" Pronunciation: [key] a grass, Panicum maximum, native to Africa, used for forage in warm regions of North and South America. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. guinea grains guinea hen Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language