Share this entry
thylakoid Syllabification: thy·la·koid
Pronunciation: /ˈTHīləˌkoid/

Definition of thylakoid in English:


Each of a number of flattened sacs inside a chloroplast, bounded by pigmented membranes on which the light reactions of photosynthesis take place, and arranged in stacks or grana.
Example sentences
  • Chloroplast envelopes, stacked grana and unstacked stroma thylakoids were well-defined.
  • Affected leaf tissue is white and the plastids lack thylakoids and chlorophyll.
  • The pigment proteolipids of thylakoids have both a photosynthetic function and a role in membrane structure.


1960s: from German Thylakoid, from Greek thulakoidēs 'pouchlike', from thulakos 'pouch'.

Definition of thylakoid in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove ads and access premium resources