bladder kelp
noun
            
               plural bladder kelps            
        
    
                                
              
          
                                                      : any of several large brown algae that have air bladders on the stipe or blade                                      
                
                                
            especially                
          
                                                      : giant kelp                                       
              
                             
            … a pool that had been gouged out of the rock shoreline by the relentless southern Pacific Ocean swells that hurl around huge bodies of bladder kelp …    — Warwick Stanley
Warwick Stanley          
                         
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  Merriam-Webster unabridged




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