"ultramafic" meaning in English

{
  "etymology_templates": [
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      "args": {
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        "2": "ultra",
        "3": "mafic"
      },
      "expansion": "ultra- + mafic",
      "name": "prefix"
    }
  ],
  "etymology_text": "From ultra- + mafic.",
  "forms": [
    {
      "form": "more ultramafic",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most ultramafic",
      "tags": [
        "superlative"
      ]
    }
  ],
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      "expansion": "ultramafic (comparative more ultramafic, superlative most ultramafic)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Geology",
          "orig": "en:Geology",
          "parents": [
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
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        },
        {
          "_dis": "85 15",
          "kind": "topical",
          "langcode": "en",
          "name": "Rocks",
          "orig": "en:Rocks",
          "parents": [
            "Geology",
            "Natural materials",
            "Earth sciences",
            "Materials",
            "Nature",
            "Sciences",
            "Manufacturing",
            "All topics",
            "Human activity",
            "Fundamental",
            "Human behaviour",
            "Human"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle."
      ],
      "id": "en-ultramafic-en-adj-~iuh-H98",
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "igneous",
          "igneous"
        ],
        [
          "magnesium",
          "magnesium"
        ],
        [
          "iron",
          "iron"
        ],
        [
          "silica",
          "silica"
        ],
        [
          "mantle",
          "mantle"
        ]
      ],
      "raw_glosses": [
        "(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle."
      ],
      "synonyms": [
        {
          "word": "ultrabasic"
        }
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "wikipedia": [
    "ultramafic"
  ],
  "word": "ultramafic"
}

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        "2": "ultra",
        "3": "mafic"
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      "expansion": "ultra- + mafic",
      "name": "prefix"
    }
  ],
  "etymology_text": "From ultra- + mafic.",
  "forms": [
    {
      "form": "ultramafics",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A rock with such properties."
      ],
      "id": "en-ultramafic-en-noun-smHsDz7V"
    }
  ],
  "word": "ultramafic"
}

{
  "categories": [
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    "English countable nouns",
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    "English nouns",
    "English terms prefixed with ultra-",
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    }
  ],
  "etymology_text": "From ultra- + mafic.",
  "forms": [
    {
      "form": "more ultramafic",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most ultramafic",
      "tags": [
        "superlative"
      ]
    }
  ],
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "en:Geology"
      ],
      "glosses": [
        "Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle."
      ],
      "links": [
        [
          "geology",
          "geology"
        ],
        [
          "igneous",
          "igneous"
        ],
        [
          "magnesium",
          "magnesium"
        ],
        [
          "iron",
          "iron"
        ],
        [
          "silica",
          "silica"
        ],
        [
          "mantle",
          "mantle"
        ]
      ],
      "raw_glosses": [
        "(geology) Describing igneous rocks that contain magnesium and iron and only a very small amount of silica, such as are found in the Earth’s mantle."
      ],
      "topics": [
        "geography",
        "geology",
        "natural-sciences"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ultrabasic"
    }
  ],
  "wikipedia": [
    "ultramafic"
  ],
  "word": "ultramafic"
}

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    "English countable nouns",
    "English entries with incorrect language header",
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    "English nouns",
    "English terms prefixed with ultra-",
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    "Pages with entries",
    "en:Rocks"
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  ],
  "etymology_text": "From ultra- + mafic.",
  "forms": [
    {
      "form": "ultramafics",
      "tags": [
        "plural"
      ]
    }
  ],
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A rock with such properties."
      ]
    }
  ],
  "word": "ultramafic"
}