資料來源 : Webster's Revised Unabridged Dictionary (1913)

Zonal \Zon"al\, a. [L. zonalis.]
   Of or pertaining to a zone; having the form of a zone or
   zones.

   {Zonal equation} (Crystallog.), the mathematical relation
      which belongs to all the planes of a zone, and expresses
      their common position with reference to the axes.

   {Zonal structure} (Crystallog.), a structure characterized by
      the arrangements of color, inclusions, etc., of a crystal
      in parallel or concentric layers, which usually follow the
      outline of the crystal, and mark the changes that have
      taken place during its growth.

   {Zonal symmetry}. (Biol.) See the Note under {Symmetry}.