hardtack
noun
                                                                                                                            
                                                            hard·tack
                    
                                                                                                              
                                                                                                                                  ˈhärd-ˌtak  
                                                      
                                                          
            
            
               plural hardtack or hardtacks            
        
    1
                    
                                          
              
          
                                                      : a saltless hard biscuit, bread, or cracker                                      
                
                    
2
                    
                                          
              
          
                                                      : any of several mountain mahoganies (especially Cercocarpus betuloides)                                      
                
                    
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  Merriam-Webster unabridged




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