aerodynamics
noun
                                                                                                                            
                                                            aero·dy·nam·ics
                    
                                                                                                              
                                                                                                                                  ˌer-ō-dī-ˈna-miks 
                                                      
                                                          
            
            
               plural in form but singular or plural in construction             
        
    1
                    
                                          
              
          
                                                      : a branch of dynamics that deals with the motion of air and other gaseous fluids and with the forces acting on bodies in motion relative to such fluids                                      
                
                    
2
                    
                                          
              
          
                                                      : the qualities of an object that affect how easily it is able to move through the air                                      
              
                             
The aerodynamics … turned out to be better than his engineers promised. The 777 was so slippery that its cruise speed was upped from .83 Mach to .84 …—
Clive Irving
                         
                
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  Merriam-Webster unabridged




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