Definition of "granum" [granum]

• A stacked membranous structure within a chloroplast that contains the chlorophyll and is the site of the light reactions of photosynthesis. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "These derive from the same Latin word granum grain: The reference is to the many fragments resulting from the detonation of a shell."
• "Thylakoids, containing chlorophyll and other accessory pigments, are in stacks called granum (grana, plural)"
• "These words are merely a commentary on those of the Master: Nisi granum frumenti cadens in terram mortuum fuerit, ipsum solum manet: "unless a grain of wheat falls into the earth and dies, it remains alone" Jn 12:24."