lamella

Concise Oxford English Dictionary © 2008 Oxford University Press:
lamella /ləˈmɛlə/

▶noun (pl. lamellae /-liː/)

• 1 a thin layer, membrane, or plate of tissue, especially in bone.

• 2 Botany a membranous fold in a chloroplast.

– derivatives
lamellar adjective,
lamellate adjective,
lamelliform adjective,
lamellose adjective.

– origin C17: from L., dimin. of lamina ‘thin plate’.