tea tree
noun
1
                    
                                          
              
          
                                                      : any of various Australasian shrubs or small trees (genus Leptospermum) of the myrtle family that form dense thickets and have aromatic evergreen foliage                                      
                
                    
2
                    
                                          
              
          
                                                      : any of various melaleucas (especially Melaleuca alternifolia) with aromatic leaves that yield an essential oil used especially as an antiseptic                                      
                
                    
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  Merriam-Webster unabridged




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