nurse shark
noun
                                
              
          
                                                      : any of various usually bottom-dwelling sharks (family Ginglymostomatidae) with barbels near the nostrils                                      
                
                                
            especially                
          
                                                      : a large yellowish to grayish brown shark (Ginglymostoma cirratum) of warm usually shallow coastal waters that is typically nonaggressive and rests often in groups on the sea floor during the day                                      
            
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  Merriam-Webster unabridged




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