periodical cicada
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.
An assembly of meshed gears consisting of a central (sun) gear, a coaxial internal gear-wheel and one or more intermediate pinions supported on a revolving carrier.
Not of or pertaining to card or cards.
plural of pseudocentipede
地下で17年間過ごした後、17年周期のセミが果樹園に現れ、鋭い鳴き声で空気を満たした。
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DiQt（ディクト）
無料
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