thylakoid

[thahy-luh-koid]
noun Cell Biology.
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.

Origin:
1965–70; < German Thylakoid < Greek thȳlakoeidḗs resembling a bag, equivalent to thȳ́lak(os) sack + -oēidēs -oid

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Science Dictionary
thylakoid   (thī'lə-koid')  Pronunciation Key 
A saclike membrane that contains the chlorophyll in cyanobacteria and in the chloroplasts of plant cells and green algae. In chloroplasts, thylakoids are arranged in stacks called grana.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for thylakoid
Inside it is an empty area called the thylakoid space or lumen.
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