: a leather or fabric case for carrying a firearm on the person (as on the hip or chest), on a saddle, or in a vehicle                                      
                
                                
            broadly                
          
                                                      : a case for carrying a usually small item on the person                                       
              
                             
            a knife holster    
                                       a heart monitor carried in a hip holster    
                         
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  Merriam-Webster unabridged




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