1
                    
        a
    
          
                                          
              
          
                                                      : a gambling game in which players bet on which compartment of a revolving wheel a small ball will come to rest in                                      
                
                    
        b
    
          
                                          
              
          
                                                      : something involving a high degree of chance and unpredictability                                      
                
                    
2
                    
        a
    
          
                                          
              
          
                                                      : any of various toothed wheels or disks (as for producing rows of dots on engraved plates or for making short consecutive incisions in paper to facilitate subsequent division)                                      
                
                    
        b
    
          
                                          
              
          
                                                      : tiny slits between rows of stamps in a sheet that are made by a roulette and serve as an aid in separation   compare perforation                                      
                
                    
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  Merriam-Webster unabridged




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