air plant
noun
            
               plural air plants            
        
    1
                    
                                          
              
          
                                                      : a plant that derives its moisture and nutrients from the air and rain and grows usually on another plant : epiphyte                                      
                
                                
            especially                
          
                                                      : any of a genus (Tillandsia) of evergreen perennial plants that are found in tropical regions of the western hemisphere and that grow on other plants, have minimal roots, and obtain nutrients and water solely from the air                                      
            
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  Merriam-Webster unabridged




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