"lava tube" meaning in English

{
  "forms": [
    {
      "form": "lava tubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "lava tube (plural lava tubes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "parents": [],
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        },
        {
          "kind": "other",
          "name": "Mandarin terms with redundant transliterations",
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            "Terms with redundant transliterations",
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          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Volcanology",
          "orig": "en:Volcanology",
          "parents": [
            "Geology",
            "Earth sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A natural conduit formed by flowing lava that moves beneath the hardened surface of a lava flow."
      ],
      "id": "en-lava_tube-en-noun-HNpI39yW",
      "links": [
        [
          "natural",
          "natural"
        ],
        [
          "conduit",
          "conduit"
        ],
        [
          "flow",
          "flow"
        ],
        [
          "lava",
          "lava"
        ],
        [
          "hardened",
          "hardened"
        ],
        [
          "surface",
          "surface"
        ]
      ],
      "related": [
        {
          "word": "skylight"
        }
      ],
      "translations": [
        {
          "code": "cmn",
          "lang": "Chinese Mandarin",
          "roman": "róngyánguǎn",
          "sense": "natural conduit",
          "word": "熔岩管"
        },
        {
          "code": "nl",
          "lang": "Dutch",
          "sense": "natural conduit",
          "tags": [
            "masculine"
          ],
          "word": "lavatunnel"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "natural conduit",
          "word": "laavatunneli"
        }
      ],
      "wikipedia": [
        "lava tube"
      ]
    }
  ],
  "word": "lava tube"
}

{
  "forms": [
    {
      "form": "lava tubes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "lava tube (plural lava tubes)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "skylight"
    }
  ],
  "senses": [
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        "English countable nouns",
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        "Terms with Dutch translations",
        "Terms with Finnish translations",
        "Terms with Mandarin translations",
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      ],
      "glosses": [
        "A natural conduit formed by flowing lava that moves beneath the hardened surface of a lava flow."
      ],
      "links": [
        [
          "natural",
          "natural"
        ],
        [
          "conduit",
          "conduit"
        ],
        [
          "flow",
          "flow"
        ],
        [
          "lava",
          "lava"
        ],
        [
          "hardened",
          "hardened"
        ],
        [
          "surface",
          "surface"
        ]
      ],
      "wikipedia": [
        "lava tube"
      ]
    }
  ],
  "translations": [
    {
      "code": "cmn",
      "lang": "Chinese Mandarin",
      "roman": "róngyánguǎn",
      "sense": "natural conduit",
      "word": "熔岩管"
    },
    {
      "code": "nl",
      "lang": "Dutch",
      "sense": "natural conduit",
      "tags": [
        "masculine"
      ],
      "word": "lavatunnel"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "natural conduit",
      "word": "laavatunneli"
    }
  ],
  "word": "lava tube"
}