From The Collaborative International Dictionary of English v.0.48:

Lamella \La*mel"la\, n.; pl. L. Lamell[ae], E. Lamellas. [L.
   lamella, dim. of lamina plate, leaf, layer: cf. F. lamelle.
   Cf. Lamina, Omelet.]
   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.
   [1913 Webster] Lamellar
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