gyrostabilizer
noun
                                                                                                                            
                                                            gy·ro·sta·bi·liz·er
                    
                                                                                                              
                                                                                                                                  ˌjī-rō-ˈstā-bə-ˌlī-zər  
                                                      
                                                          
            
            variants  
 or gyrostat    
        
    
                                
              
          
                                                      : a stabilizing device (as for a ship or airplane) that consists of a continuously driven gyro spinning about a vertical axis and pivoted so that its axis of spin may be tipped fore-and-aft in the vertical plane and that serves to oppose sideways motion                                      
                
                    
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  Merriam-Webster unabridged




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