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A lamella (plural lamellae) is a small plate or flake, from the Latin, and may also be used to refer to collections of fine sheets of material held adjacent to one another, in a gill-shaped structure, often with fluid in between though sometimes simply a set of 'welded' plates. The term is used in biological and engineering contexts, such as filters and heat exchangers. The microscopic structures in bone and nacre are lamellae in the materials science sense of the word. Moreover, the term lamella is often used as a way to describe crystal structure of some materials. 
Uses of the term
In surface chemistry (especially mineralogy and materials science), lamellar structures are fine layers, alternating between different materials. They can be produced by chemical effects (as in eutectic solidification), biological means, or a deliberate process of lamination, such as pattern welding. Lamellae can also describe the layers of atoms in the crystal lattice of a material such as a metal.
The medical profession, specifically orthopedic surgeons, use the term to refer to 3D printed titanium technology which is used to generate implantable medical devices.
In a water-treatment context, lamellar filters may be referred to as plate filters or tube filters.
This term is used to describe a certain type of ichthyosis, a congenital skin condition. Lamellar Ichthyosis often presents with a "colloidal" membrane at birth. It is characterized by generalized dark scaling.
The term lamella(e) is used in the flooring industry to describe the finished top-layer of an engineered wooden floor. For example, an engineered walnut floor will have several layers of wood and a top walnut lamella.
In September 2010, the U.S. Food and Drug Administration (FDA) announced a recall of two medications which contained "extremely thin glass flakes (lamellae) that are barely visible in most cases. The lamellae result from the interaction of the formulation with glass vials over the shelf life of the product."
- Dorset, D. L. (1995-12-01). "The crystal structure of waxes". Acta Crystallographica Section B Structural Science. 51 (6): 1021–1028. doi:10.1107/s0108768195005465. ISSN 0108-7681. PMID 8554724.
- "New 3D Printed Lamellar Titanium Technology encourages bone growth with spinal implants". 3ders.org. Retrieved 2020-05-06.
- Schoeser, Mary (2007). Silk. New Haven: Yale University Press. p. 248. ISBN 9780300117417. Retrieved 30 January 2018.
- Amgen Initiates Voluntary Nationwide Recall of Certain Lots Of Epogen And Procrit (Epoetin Alfa)