Source : Webster's Revised Unabridged Dictionary (1913)

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.

Source : WordNet®

lamella
     n 1: any of the radiating leaflike spore-producing structures on
          the underside of the cap of a mushroom or similar fungus
          [syn: {gill}]
     2: a thin membrane that is one of the calcified layers that
        form bones
     3: thin plate
     [also: {lamellae} (pl)]

lamellae
     See {lamella}