Meaning of 研石 in Japanese
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研
石
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Definition of 研石
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(n) stone
その子供は小さな石を拾い上げた。
The child picked up a small stone.
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gem; jewel
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(n) measure of volume (approx. 180.39 liters, 6.37 cub. ft.)
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measure of a Japanese-style boat's loading capacity (approx. 278.26 liters)