"東北日本" meaning in 日本語

{
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語_固有名詞",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "とうほくにほん"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "name",
  "pos_title": "固有名詞",
  "related": [
    {
      "word": "西南日本"
    }
  ],
  "senses": [
    {
      "glosses": [
        "《地質学》フォッサマグナを境として、東側の日本列島。"
      ],
      "id": "ja-東北日本-ja-name-g6pwPd8b"
    }
  ],
  "word": "東北日本"
}

{
  "categories": [
    "日本語",
    "日本語_固有名詞"
  ],
  "forms": [
    {
      "form": "とうほくにほん"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "name",
  "pos_title": "固有名詞",
  "related": [
    {
      "word": "西南日本"
    }
  ],
  "senses": [
    {
      "glosses": [
        "《地質学》フォッサマグナを境として、東側の日本列島。"
      ]
    }
  ],
  "word": "東北日本"
}