Pot stone - Tsuboishi

Japanese: 壺石 - ツボイシ
Pot stone - Tsuboishi
A pot-shaped nodule solidified with lime and iron. It is spherical or elliptical, 5 to 10 centimeters in diameter, and hollow. Gifu Prefecture Toki Time Those produced in the city are natural monuments.

Source: About Shogakukan Digital Daijisen Information | Legend

Japanese:
石灰分や鉄分で固化された壺状の団塊。直径5~10センチの球または楕円状で、中空。岐阜県土岐とき市に産するものは天然記念物。

出典 小学館デジタル大辞泉について 情報 | 凡例

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