/ Dictionary / Index G granum: Meaning and Definition of Find definitions for: gra•num Pronunciation: (grā'num), [key] — pl. -na (in prescriptions) a grain. one of the structural units of a chloroplast in vascular plants, consisting of layers of thylakoids. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. granulose Granville 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