Jisho

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といし 砥石
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Noun
1. whetstone; grindstone​
Wikipedia definition
2. Sharpening stone​Sharpening stones, water stones or whetstones are used to grind and hone the edges of steel tools and implements. Examples of items that may be sharpened with a sharpening stone include scissors, scythes, knives, razors and tools such as chisels, hand scrapers and plane blades. Though it is sometimes mistaken as a reference to the water often used to lubricate such stones, the word "whetstone" is a compound word formed with the word "whet," which means to sharpen a blade, not the word "wet".
Read “Sharpening stone” on English Wikipedia
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Read “Sharpening stone” on DBpedia

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