arboretum
noun
                                                                                                                            
                                                            ar·bo·re·tum
                    
                                                                                                              
                                                                                                                                  ˌär-bə-ˈrē-təm  
                                                      
                                                          
            
            
               plural arboretums or arboreta
                                        ˌär-bə-ˈrē-tə  
    
            
        
    
                                
              
          
                                                      : a place where trees, shrubs, and herbaceous plants are cultivated for scientific and educational purposes                                      
                
                    
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  Merriam-Webster unabridged




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