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ZONAL - Definiția din dicționar

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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]