2
                    
        a
    
          
                                          
              
          
                                                      : a niche for a sculpture                                      
                
                    
        b
    
          
                                          
              
          
                                                      : the space taken out of a structural member (such as a timber) to admit the insertion of part of another                                      
                
                    
3
                    
                                          
              
          
                                                      : something that covers or protects: such as                                      
                
                    
        a
    
          
                                          
              
          
                                                      : a case or enclosure (as for a mechanical part or an instrument)                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a casing (such as an enclosed bearing) in which a shaft revolves                                      
                
                    
        c
    
          
                                          
              
          
                                                      : a support (such as a frame) for mechanical parts                                      
                
                    
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  Merriam-Webster unabridged




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