"grinding stone" meaning in English

{
  "forms": [
    {
      "form": "grinding stones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grinding stone (plural grinding stones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Assamese translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Central Sierra Miwok translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with German translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Tools",
          "orig": "en:Tools",
          "parents": [
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "2014, Paul Salopek, Blessed. Cursed. Claimed., National Geographic (December 2014)https://web.archive.org/web/20150212214621/http://ngm.nationalgeographic.com/2014/12/pilgrim-roads/salopek-text\nCircular dwellings, grinding stones, stone tools—its village relics date back an astonishing 12,000 years, deep into our nomadic Stone Age."
        }
      ],
      "glosses": [
        "A stone tool, used with a quern, to grind cereals."
      ],
      "id": "en-grinding_stone-en-noun-usk3EpTc",
      "links": [
        [
          "stone",
          "stone"
        ],
        [
          "tool",
          "tool"
        ],
        [
          "quern",
          "quern"
        ],
        [
          "grind",
          "grind"
        ],
        [
          "cereal",
          "cereal"
        ]
      ],
      "translations": [
        {
          "code": "as",
          "lang": "Assamese",
          "roman": "pota",
          "sense": "tool",
          "word": "পটা"
        },
        {
          "code": "csm",
          "lang": "Central Sierra Miwok",
          "sense": "tool",
          "word": "paṭ·a-"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "tool",
          "tags": [
            "masculine"
          ],
          "word": "Mahlstein"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "tool",
          "tags": [
            "masculine"
          ],
          "word": "Reibstein"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "tool",
          "tags": [
            "feminine"
          ],
          "word": "Handmühle"
        }
      ]
    }
  ],
  "word": "grinding stone"
}

{
  "forms": [
    {
      "form": "grinding stones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "grinding stone (plural grinding stones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Assamese translations",
        "Terms with Central Sierra Miwok translations",
        "Terms with German translations",
        "en:Tools"
      ],
      "examples": [
        {
          "text": "2014, Paul Salopek, Blessed. Cursed. Claimed., National Geographic (December 2014)https://web.archive.org/web/20150212214621/http://ngm.nationalgeographic.com/2014/12/pilgrim-roads/salopek-text\nCircular dwellings, grinding stones, stone tools—its village relics date back an astonishing 12,000 years, deep into our nomadic Stone Age."
        }
      ],
      "glosses": [
        "A stone tool, used with a quern, to grind cereals."
      ],
      "links": [
        [
          "stone",
          "stone"
        ],
        [
          "tool",
          "tool"
        ],
        [
          "quern",
          "quern"
        ],
        [
          "grind",
          "grind"
        ],
        [
          "cereal",
          "cereal"
        ]
      ]
    }
  ],
  "translations": [
    {
      "code": "as",
      "lang": "Assamese",
      "roman": "pota",
      "sense": "tool",
      "word": "পটা"
    },
    {
      "code": "csm",
      "lang": "Central Sierra Miwok",
      "sense": "tool",
      "word": "paṭ·a-"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "tool",
      "tags": [
        "masculine"
      ],
      "word": "Mahlstein"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "tool",
      "tags": [
        "masculine"
      ],
      "word": "Reibstein"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "tool",
      "tags": [
        "feminine"
      ],
      "word": "Handmühle"
    }
  ],
  "word": "grinding stone"
}