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thylakoid Line breaks: thyla|koid
Pronunciation: /ˈθʌɪləkɔɪd/

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: [as modifier]: thylakoid membranes
More 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 'pouch-like', from thulakos 'pouch'.

Definition of thylakoid in:
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