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                                                      : of, relating to, affecting, or having the form of a zone                                      
              
                             
a zonal boundary
                         
                
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                                                      : of, relating to, or being a soil or a major soil group marked by well-developed characteristics that are determined primarily by the action of climate and organisms (such as vegetation)   compare azonal, intrazonal                                      
                
                    
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  Merriam-Webster unabridged




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