granum
nounUK /ˈɡreɪnəm/
US /ˈɡreɪnəm/
A granum is a tiny stack of green parts inside a plant cell that helps the plant make food from sunlight.
The chloroplast contains many grana, each made of stacked thylakoids.
RELATED WORDS
OTHER MEANINGS
2. A small grain or seed, especially of a cereal plant.
Each granum of wheat was carefully counted.
3. A small particle or granule in a substance.
The powder was made of fine grana.
4. In botany, a grain-like structure or body.
The microscope revealed grana within the cell.