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The Collaborative International Dictionary of English v.0.48 (gcide)

Zonal \Zon"al\, a. [L. zonalis.]
Of or pertaining to a zone; having the form of a zone or
zones.
[1913 Webster]

{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}.
[1913 Webster]

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