"caixa-negra" meaning in Portuguese

{
  "forms": [
    {
      "form": "caixas-negras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "++"
      },
      "expansion": "caixa-negra f (plural caixas-negras)",
      "name": "pt-noun"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Portuguese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "pt",
          "name": "Aviation",
          "orig": "pt:Aviation",
          "parents": [
            "Aeronautics",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "black box (recorder in an aircraft)"
      ],
      "id": "en-caixa-negra-pt-noun-21niQR4k",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "black box",
          "black box"
        ]
      ],
      "raw_glosses": [
        "(aviation) black box (recorder in an aircraft)"
      ],
      "synonyms": [
        {
          "word": "caixa-preta"
        },
        {
          "word": "caixa negra"
        }
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌkaj.ʃɐˈne.ɡɾɐ/",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "[ˌkaɪ̯.ʃɐˈne.ɡɾɐ]",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "/ˌkaj.ʃɐˈne.ɡɾɐ/",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "[ˌkaɪ̯.ʃɐˈne.ɡɾɐ]",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "/ˌkaj.ʃaˈne.ɡɾa/",
      "tags": [
        "Southern-Brazil"
      ]
    },
    {
      "ipa": "[ˌkaɪ̯.ʃaˈne.ɡɾa]",
      "tags": [
        "Southern-Brazil"
      ]
    },
    {
      "ipa": "/ˌkaj.ʃɐˈne.ɡɾɐ/",
      "tags": [
        "Portugal"
      ]
    },
    {
      "ipa": "[ˌkaj.ʃɐˈne.ɣɾɐ]",
      "tags": [
        "Portugal"
      ]
    }
  ],
  "word": "caixa-negra"
}

{
  "forms": [
    {
      "form": "caixas-negras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "++"
      },
      "expansion": "caixa-negra f (plural caixas-negras)",
      "name": "pt-noun"
    }
  ],
  "lang": "Portuguese",
  "lang_code": "pt",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Portuguese 4-syllable words",
        "Portuguese countable nouns",
        "Portuguese entries with incorrect language header",
        "Portuguese feminine nouns",
        "Portuguese lemmas",
        "Portuguese multiword terms",
        "Portuguese nouns",
        "Portuguese nouns with red links in their headword lines",
        "Portuguese terms with IPA pronunciation",
        "pt:Aviation"
      ],
      "glosses": [
        "black box (recorder in an aircraft)"
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "black box",
          "black box"
        ]
      ],
      "raw_glosses": [
        "(aviation) black box (recorder in an aircraft)"
      ],
      "synonyms": [
        {
          "word": "caixa-preta"
        }
      ],
      "tags": [
        "feminine"
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˌkaj.ʃɐˈne.ɡɾɐ/",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "[ˌkaɪ̯.ʃɐˈne.ɡɾɐ]",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "/ˌkaj.ʃɐˈne.ɡɾɐ/",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "[ˌkaɪ̯.ʃɐˈne.ɡɾɐ]",
      "tags": [
        "Brazil"
      ]
    },
    {
      "ipa": "/ˌkaj.ʃaˈne.ɡɾa/",
      "tags": [
        "Southern-Brazil"
      ]
    },
    {
      "ipa": "[ˌkaɪ̯.ʃaˈne.ɡɾa]",
      "tags": [
        "Southern-Brazil"
      ]
    },
    {
      "ipa": "/ˌkaj.ʃɐˈne.ɡɾɐ/",
      "tags": [
        "Portugal"
      ]
    },
    {
      "ipa": "[ˌkaj.ʃɐˈne.ɣɾɐ]",
      "tags": [
        "Portugal"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "caixa negra"
    }
  ],
  "word": "caixa-negra"
}