Jisho

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こうちゅうるい 甲虫類
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Noun
1. beetles; coleopterans; coleoptera​See also 甲虫目
Wikipedia definition
2. Beetle​Coleoptera is an order of insects commonly called beetles. The word "coleoptera" is from the Greek κολεός, koleos, meaning "sheath"; and πτερόν, pteron, meaning "wing", thus "sheathed wing". The reason for the name is that most beetles have two pairs of wings, the front pair, the "elytra", being hardened and thickened into a sheath-like, or shell-like, protection for the rear pair, and for the rear part of the beetle's body.
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