groundnut
noun
                                                                                                                            
                                                            ground·nut
                    
                                                                                                              
                                                                                                                                  ˈgrau̇n(d)-ˌnət  
                                                      
                                                          
            1
                    
        a
    
          
                                          
              
          
                                                      : any of several plants having edible tuberous roots                                      
                
                                
            especially                
          
                                                      : a North American leguminous vine (Apios americana) with pinnate leaves and clusters of brownish-purple fragrant flowers                                      
            
            
        b
    
          
                                          
              
          
                                                      : the root of a groundnut                                      
                
                    
2
                    
                                chiefly British 
                                  
              
          
                                                      : peanut                                      
                
                    
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  Merriam-Webster unabridged




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