periodical cicada

periodical-cicada的词性：
n.（名词）

1. A cicada of the genus Magicicada of the eastern United States whose 17-year or 13-year life cycle consists almost entirely of a nymphal stage spent underground. Upon emerging from this stage, the periodical cicada transforms into a winged adult, mates, lays eggs, and dies shortly thereafter. Also called seventeen-year locust
周期蝉，十七年蝉：一种周期蝉 属的蝉，产于美国东部，17或13年的生命周期几乎包括整个生活于地下的蛹的时期。在此阶段之后，晚秀蝉变成有翅的成虫，交配和产卵后不久死亡 也作 seventeen-year locust