hirudin
noun
                                                                                                                            
                                                            hi·ru·din
                    
                                                                                                              
                                                                                                                                  hi-ˈrü-dᵊn  ˈhir-(y)ə-
                                                                                                                                  ˈhir-(y)ə-  
                                                      
                                                          
            
                                
              
          
                                                      : an anticoagulant extracted from the buccal glands of the medicinal leech                                      
                
                    
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  Merriam-Webster unabridged




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