[ thahy-luh-koid ]
/ ˈθaɪ ləˌkɔɪd /

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.

Nearby words

  1. thx,
  2. thy,
  3. thyatira,
  4. thyestes,
  5. thylacine,
  6. thym-,
  7. thyme,
  8. thymectomy,
  9. thymelaeaceous,
  10. thymelcosis

Origin of thylakoid

1965–70; < German Thylakoid < Greek thȳlakoeidḗs resembling a bag, equivalent to thȳ́lak(os) sack + -oēidēs -oid Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for thylakoid


[ thīlə-koid′ ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.