"H II region" meaning in English

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  "etymology_text": "From a being region of space having H_(II) emission lines in its spectrum.",
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    {
      "form": "H II regions",
      "tags": [
        "plural"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "A large nebula of gas and plasma of glowing low density in which star formation has recently taken place."
      ],
      "id": "en-H_II_region-en-noun-kRGbLWmF",
      "links": [
        [
          "astronomy",
          "astronomy"
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        [
          "nebula",
          "nebula"
        ],
        [
          "gas",
          "gas"
        ],
        [
          "plasma",
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      "raw_glosses": [
        "(astronomy) A large nebula of gas and plasma of glowing low density in which star formation has recently taken place."
      ],
      "related": [
        {
          "word": "HII emission line"
        },
        {
          "word": "H-II emission line"
        },
        {
          "word": "HI region"
        },
        {
          "word": "H-I region"
        },
        {
          "word": "H I region"
        }
      ],
      "synonyms": [
        {
          "word": "HII region"
        },
        {
          "word": "H-II region"
        }
      ],
      "topics": [
        "astronomy",
        "natural-sciences"
      ],
      "wikipedia": [
        "H II region"
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    }
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  "word": "H II region"
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  "etymology_text": "From a being region of space having H_(II) emission lines in its spectrum.",
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  "pos": "noun",
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    {
      "word": "HII emission line"
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    {
      "word": "H-II emission line"
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    {
      "word": "HI region"
    },
    {
      "word": "H-I region"
    },
    {
      "word": "H I region"
    }
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      "word": "H-II region"
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  "word": "H II region"
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