"rockwool" meaning in English

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  "etymology_text": "From rock + wool.",
  "forms": [
    {
      "form": "rockwools",
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      "form": "rock wool",
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  "lang_code": "en",
  "pos": "noun",
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        "Inorganic material resembling fiber, used primarily for insulation and soundproofing."
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          "ref": "1997, George F. Van Patten, Alyssa F. Bust, Gardening Indoors with Cuttings:",
          "text": "In 1985, rockwool was introduced to the United States as an alternative to conventional soil and other soilless mediums. Rockwool is made of thin fibers of volcanic rock or a combination of volcanic rock, limestone, and coke.",
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        "A horticultural growing medium made from natural ingredients, usually including basalt rock and chalk."
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  "word": "rockwool"
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  "etymology_text": "From rock + wool.",
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    {
      "form": "rockwools",
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      "form": "rock wool",
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        }
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  "word": "rockwool"
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