water hemlock
noun
                                
              
          
                                                      : a tall poisonous Eurasian perennial herb (Cicuta virosa) of the carrot family                                      
                
                                
            also                
          
                                                      : any of several poisonous North American plants (especially Cicuta maculata and C. douglasii) of the same genus   compare poison hemlock                                      
            
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  Merriam-Webster unabridged




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