"train d'atterrissage" meaning in French

{
  "forms": [
    {
      "form": "train d’ atterrissage",
      "tags": [
        "canonical",
        "masculine"
      ]
    },
    {
      "form": "trains d’atterrissage",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "train d’atterrissage m (plural trains d’atterrissage)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Aviation",
          "orig": "fr:Aviation",
          "parents": [
            "Aeronautics",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "landing gear"
      ],
      "id": "en-train_d'atterrissage-fr-noun-BJzAaxfn",
      "links": [
        [
          "landing gear",
          "landing gear"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tʁɛ̃ d‿a.tɛ.ʁi.saʒ/"
    },
    {
      "ipa": "/tʁɛ̃ d‿a.te.ʁi.saʒ/"
    }
  ],
  "word": "train d'atterrissage"
}

{
  "forms": [
    {
      "form": "train d’ atterrissage",
      "tags": [
        "canonical",
        "masculine"
      ]
    },
    {
      "form": "trains d’atterrissage",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "train d’atterrissage m (plural trains d’atterrissage)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French countable nouns",
        "French entries with incorrect language header",
        "French lemmas",
        "French masculine nouns",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Aviation"
      ],
      "glosses": [
        "landing gear"
      ],
      "links": [
        [
          "landing gear",
          "landing gear"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/tʁɛ̃ d‿a.tɛ.ʁi.saʒ/"
    },
    {
      "ipa": "/tʁɛ̃ d‿a.te.ʁi.saʒ/"
    }
  ],
  "word": "train d'atterrissage"
}