from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A stacked membranous structure within a chloroplast that contains the chlorophyll and is the site of the light reactions of photosynthesis.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a stacklike structure in plant chloroplasts that contain chlorophyll; the site of photosynthesis
Latin grānum, seed; see grain.(American Heritage® Dictionary of the English Language, Fourth Edition)