Definition of thylakoid in English:


Line breaks: thyla|koid
Pronunciation: /ˈθʌɪləkɔɪd


  • 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'.

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grotesque quality or grotesque things collectively