Define the term - lamellac

The inner membrane is folded into very closely packed membranes called the lamellac. The lamellae flatten out at regular intervals into structures called the thylakoids, which are frequently found stacked one above that:  other to form grana. The matrix between the thylakoids is called the stroma and contains all the proteins and other factors involved in the photosynthetic fixation of C02 (Calvin cycle enzymes). The stroma also contains DNA and some of the chloroplast DNA is synthesised within the organelle.