1
                    
                                often capitalized                                  
              
          
                                                      : any of a group of female and partly human creatures in Greek mythology that lured mariners to destruction by their singing                                      
                
                    
2
                    
                  3
                    
        a
    
          
                                          
              
          
                                                      : an apparatus producing musical tones especially in acoustical studies by the rapid interruption of a current of air, steam, or fluid by a perforated rotating disk                                      
                
                    
        b
    
          
                                          
              
          
                                                      : a device often electrically operated for producing a penetrating warning sound                                      
              
                             
an ambulance siren
                                       an air-raid siren
                         
                
                    4
                    
                                  
          
[New Latin, from Latin]                                  
              
          
                                                      : either of two North American eel-shaped amphibians that constitute a genus (Siren) and have small forelimbs but neither hind legs nor pelvis and have permanent external gills as well as lungs                                      
                
                    
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  Merriam-Webster unabridged




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