Jisho

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Noun
1. ground stone tool; polished stone tool
Wikipedia definition
2. Ground stoneIn archaeology, ground stone is a category of stone tool formed by the grinding of a coarse-grained tool stone, either purposely or incidentally. Ground stone tools are usually made of basalt, rhyolite, granite, or other macrocrystalline igneous stones whose coarse structure makes them ideal for grinding other materials, including plants and other stones. In Europe the adoption of ground stone technology is associated closely with the Neolithic.
Read “Ground stone” on English Wikipedia
Read “磨製石器” on Japanese Wikipedia
Read “Ground stone” on DBpedia

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