Definition of thylakoid in English:

thylakoid

noun

Botany
  • 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’
    • ‘The pigment proteolipids of thylakoids have both a photosynthetic function and a role in membrane structure.’
    • ‘Chloroplast envelopes, stacked grana and unstacked stroma thylakoids were well-defined.’
    • ‘Affected leaf tissue is white and the plastids lack thylakoids and chlorophyll.’
    • ‘Chloroplasts at the proximal end of the cell also have grana, but with up to nine thylakoids per stack.’
    • ‘This organelle contains a complex membrane system, the thylakoids, in which the photosynthetic machinery is located.’

Origin

1960s: from German Thylakoid, from Greek thulakoidēs pouch-like, from thulakos pouch.

Pronunciation:

thylakoid

/ˈθʌɪləkɔɪd/