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Noun
seventeen-year locust
periodical cicada
Magicicada septendecim
Definition: North American cicada; appears in great numbers at infrequent intervals because the nymphs take 13 to 17 years to mature
Definition: Any of certain species of cicadas, especially in genus Magicicada, which are known for their 17- and 13-year life-cycles, during most of which they develop underground, emerging in large numbers for a short time as large and audible adults, all those emerging in a year constituting a brood.