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thylakoid

[thahy-luh-koid]
noun Cell Biology.
  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.
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Origin of thylakoid

1965–70; < German Thylakoid < Greek thȳlakoeidḗs resembling a bag, equivalent to thȳ́lak(os) sack + -oēidēs -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

thylakoid in Science

thylakoid

[thīlə-koid′]
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.