Zon"al(?), a. [L. zonalis.] Of or pertaining to a zone; having the form of a zone or zones.
(Crystallog.), the mathematical relation which belongs to all the planes of a zone, and expresses their common position with reference to the axes. --
(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. --
(Biol.) See the Note under Symmetry.
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