Lamella n. : a thin plate or scale of anything, as a thin scale growing from the petals of certain flowers; or one of the thin plates or scales of which certain shells are composed.

Example:
What is the function of the middle Lamella in plant cells?

Taxonomy
Lamella, free encyclopedia, thin layer, search, free dictionary, platelike, materials sciences, Latin, derivation, laminate, mushroom, geological, synthetic materials, sub-cellular, cellular structure, Lamella clarifier, water treatment process, medieval type.

Defination from the web:
Lamella is a term for a platelike structure, appearing in multiples, that occurs in various situations, such as biology or materials sciences. ... Lamella clarifier, a water treatment process. Lamellar armour, a medieval type of armour similar to scale armour ...