granum

(grā'nəm)
n., pl., -na (-nə).
A stacked membranous structure within a chloroplast that contains the chlorophyll and is the site of the light reactions of photosynthesis.

[Latin grānum, seed. See grain.]

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(pl. grana)

a stack of disclike thylakoids resembling a pile of coins. Grana occur in chloroplasts, especially in higher plants.

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[L.] grain; very small particles.