anabaena
noun
                                                                                                                            
                                                            an·a·bae·na
                    
                                                                                                              
                                                                                                                                  ˌan-ə-ˈbē-nə 
                                                      
                                                          
            1
                    
                                capitalized                                  
              
          
                                                      : a genus of freshwater cyanobacteria (family Nostocaceae) having cells in beadlike filaments and often contaminating reservoirs                                      
                
                    
2
                    
                                          
              
          
                                                      : a cyanobacterium of the genus Anabaena                                      
                
                    
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