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Zonal structure | 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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