granum: Meaning and Definition of

gra•num

Pronunciation: (grā'num), [key]
— pl. -na
  1. (in prescriptions) a grain.
  2. 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.