seventeen-year locust
noun
                                
              
          
                                                      : a cicada (Magicicada septendecim) of the U.S. that lives most of its life as a wingless underground nymph and emerges from the ground after seventeen years in the North and after thirteen years in the South to spend only a few weeks as a winged adult                                      
                
                    
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  Merriam-Webster unabridged




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