"天底" meaning in 日本語

{
  "antonyms": [
    {
      "word": "天頂"
    }
  ],
  "categories": [
    {
      "kind": "other",
      "name": "日本語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日本語 名詞",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "てんてい"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "日本語 天文学",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "地球上の観測地点から重力がかかる方向へ延ばした線が天球と交わる点。"
      ],
      "id": "ja-天底-ja-noun-z0u17Kym",
      "topics": [
        "astronomy"
      ]
    }
  ],
  "translations": [
    {
      "lang": "英語",
      "lang_code": "en",
      "word": "nadir"
    }
  ],
  "word": "天底"
}

{
  "antonyms": [
    {
      "word": "天頂"
    }
  ],
  "categories": [
    "日本語",
    "日本語 名詞"
  ],
  "forms": [
    {
      "form": "てんてい"
    }
  ],
  "lang": "日本語",
  "lang_code": "ja",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "categories": [
        "日本語 天文学"
      ],
      "glosses": [
        "地球上の観測地点から重力がかかる方向へ延ばした線が天球と交わる点。"
      ],
      "topics": [
        "astronomy"
      ]
    }
  ],
  "translations": [
    {
      "lang": "英語",
      "lang_code": "en",
      "word": "nadir"
    }
  ],
  "word": "天底"
}