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Meaning of thylakoid

thy•la•koid

Pronunciation: (thī'lu-koid"), [key]
— n. Cell Biol.
  1. a flattened sac or vesicle lined with a pigmented membrane that is the site of photosynthesis, in plants and algae occurring in interconnected stacks constituting a granum of the chloroplast, and in other photosynthesizing organisms occurring either singly or as part of the cell membrane or other structure.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.