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  1. Oxford American Dictionary

    periodical cicada

    • IPA[ˌpirēˈädəkəl səˈkādə]
    • n.
      an American cicada whose nymphs emerge from the soil in large numbers periodically. The mature nymphs of the northern species (seventeen-year locust) emerge every seventeen years; those of the southern species emerge every thirteen years. A cicada brood can be so abundant that the shrill sound emitted by the males can damage the human ear.

    • noun: periodical cicada, plural noun: periodical cicadas