Source : Webster's Revised Unabridged Dictionary (1913)

Lamina \Lam"i*na\ (l[a^]m"[i^]*n[.a]), n.; pl. L. {Lamin[ae]}
   (-n[=e]) E. {Laminas} (-n[.a]z). [L. cf. {Lamella}.]
   1. A thin plate or scale; a layer or coat lying over another;
      -- said of thin plates or platelike substances, as of bone
      or minerals.

   2. (Bot.) The blade of a leaf; the broad, expanded portion of
      a petal or sepal of a flower. --Gray.

   3. (Zo["o]l.) A thin plate or scale; specif., one of the
      thin, flat processes composing the vane of a feather.

Source : WordNet®

lamina
     n : a thin plate or layer (especially of bone or mineral)
     [also: {laminae} (pl)]

laminae
     See {lamina}