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.
< German Thylakoid
< Greek thȳlakoeidḗs
resembling a bag, equivalent to thȳ́lak
) sack + -oēidēs -oid