Definition of grana in English:

grana

plural noun

Botany
  • The stacks of thylakoids embedded in the stroma of a chloroplast.

    • ‘Chloroplast envelopes, stacked grana and unstacked stroma thylakoids were well-defined.’
    • ‘The VPC chloroplasts possessed well-developed thylakoids with grana.’
    • ‘The thylakoid system was normally developed with grana composed of, on average, three to four stacked thylakoids.’
    • ‘The chloroplasts with large grana stacks were seen in 50% of cases but none of the parameters significantly explained the occurrence.’
    • ‘Sometimes grana lost their stacked organization and appeared to slide partially apart at the partitions.’

Origin

Late 19th century: plural of Latin granum grain.

Pronunciation:

grana

/ˈɡrānə/