"Perseus Arm" meaning in English

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  "etymology_templates": [
    {
      "args": {
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        "2": "Perseus",
        "3": "arm"
      },
      "expansion": "Perseus + arm",
      "name": "compound"
    }
  ],
  "etymology_text": "Perseus + arm",
  "head_templates": [
    {
      "args": {
        "head": "Perseus Arm"
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      "expansion": "Perseus Arm",
      "name": "en-proper-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Astronomy",
          "orig": "en:Astronomy",
          "parents": [
            "Sciences",
            "Space",
            "All topics",
            "Nature",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "A spiral arm in Milky Way Galaxy."
      ],
      "id": "en-Perseus_Arm-en-name-z~F09rz-",
      "links": [
        [
          "Milky Way Galaxy",
          "Milky Way Galaxy#English"
        ]
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "Yīngxiānbì",
          "sense": "spiral arm",
          "word": "英仙臂"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "spiral arm",
          "word": "Perseuksen haara"
        }
      ],
      "wikipedia": [
        "en:Perseus Arm"
      ]
    }
  ],
  "word": "Perseus Arm"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "Perseus",
        "3": "arm"
      },
      "expansion": "Perseus + arm",
      "name": "compound"
    }
  ],
  "etymology_text": "Perseus + arm",
  "head_templates": [
    {
      "args": {
        "head": "Perseus Arm"
      },
      "expansion": "Perseus Arm",
      "name": "en-proper-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
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      ],
      "glosses": [
        "A spiral arm in Milky Way Galaxy."
      ],
      "links": [
        [
          "Milky Way Galaxy",
          "Milky Way Galaxy#English"
        ]
      ],
      "wikipedia": [
        "en:Perseus Arm"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "Yīngxiānbì",
      "sense": "spiral arm",
      "word": "英仙臂"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "spiral arm",
      "word": "Perseuksen haara"
    }
  ],
  "word": "Perseus Arm"
}