Jisho

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ちゅうけつ 柱穴
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Noun
1. posthole (archaeology)​
Wikipedia definition
2. Posthole​In archaeology a posthole is a cut feature used to hold a surface timber or stone. They are usually much deeper than they are wide although truncation may not make this apparent. Although the remains of the timber may survive most postholes are mainly recognisable as circular patches of darker earth when viewed in plan. Archaeologists can use their presence to plot the layout of former structures as the holes may define its corners and sides.
Read “Posthole” on English Wikipedia
Read “柱穴” on Japanese Wikipedia
Read “Posthole” on DBpedia
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柱穴 【はしらあな】

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