"metallic hydrogen" meaning in English

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      "expansion": "metallic + hydrogen",
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  "etymology_text": "From metallic + hydrogen. From hydrogen being like a metal, having free-roaming electrons that support electrical conductivity.",
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      "glosses": [
        "a degenerate matter phase of hydrogen that is electrically conductive; formed under extreme pressure"
      ],
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          "degenerate matter",
          "degenerate matter"
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          "phase",
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        [
          "hydrogen",
          "hydrogen"
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      ],
      "related": [
        {
          "word": "dark hydrogen"
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      "tags": [
        "uncountable"
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  "word": "metallic hydrogen"
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  "etymology_text": "From metallic + hydrogen. From hydrogen being like a metal, having free-roaming electrons that support electrical conductivity.",
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  "pos": "noun",
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      "word": "dark hydrogen"
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        "a degenerate matter phase of hydrogen that is electrically conductive; formed under extreme pressure"
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  "word": "metallic hydrogen"
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