hydrotaxis
noun
                                                                                                                            
                                                            hy·dro·tax·is
                    
                                                                                                              
                                                                                                                                  ˌhī-drə-ˈtak-səs  
                                                      
                                                          
            
            
               plural hydrotaxes
                                        -ˌsēz  
    
            
        
    
                                
              
          
                                                      : a taxis in which moisture is the directive factor                                      
                
                    
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  Merriam-Webster unabridged




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