Periodical-cicada meaning

Any of several cicadas of the genus Magicicada of the eastern United States that have a 17-year or 13-year life cycle and spend most of their lives underground as nymphs. Broods of periodical cicadas in a given region emerge synchronously in large numbers, metamorphosing into winged adults that mate, lay eggs, and die shortly thereafter.
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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.
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