Definition of periodical cicada in English:

periodical cicada

Syllabification: pe·ri·od·i·cal ci·ca·da

noun

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.
  • Genus Magicicada, family Cicadidae, suborder Homoptera: six species
More example sentences
  • It is not known how periodical cicadas synchronize their life cycles over 13 or 17 years - or how they manage to count out the years.
  • The fact that periodical cicadas emerge after a prime number of years could be just a coincidence.
  • But the lack of a viable predator control of the periodical cicadas doesn't mean the periodical cicadas have no predators, or no effect on their predators' lives.

Definition of periodical cicada in:

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Word of the day internecine
Pronunciation: ˌintərˈnesēn
adjective
destructive to both sides in a conflict