"Cooper vane" meaning in English

{
  "etymology_text": "After Dan Cooper, the false name used by an unidentified hijacker who used the rear stairway to exit a Boeing 727 in flight and escape using a parachute.",
  "forms": [
    {
      "form": "Cooper vanes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Cooper vane (plural Cooper vanes)",
      "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"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Aviation",
          "orig": "en:Aviation",
          "parents": [
            "Aeronautics",
            "Transport",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight."
      ],
      "id": "en-Cooper_vane-en-noun-2oDHOhfj",
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "mechanical",
          "mechanical"
        ],
        [
          "aerodynamic",
          "aerodynamic"
        ],
        [
          "wedge",
          "wedge"
        ],
        [
          "ventral",
          "ventral"
        ],
        [
          "airstair",
          "airstair"
        ],
        [
          "aircraft",
          "aircraft"
        ],
        [
          "lower",
          "lower"
        ],
        [
          "flight",
          "flight"
        ]
      ],
      "raw_glosses": [
        "(aviation) A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight."
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "D. B. Cooper"
      ]
    }
  ],
  "word": "Cooper vane"
}

{
  "etymology_text": "After Dan Cooper, the false name used by an unidentified hijacker who used the rear stairway to exit a Boeing 727 in flight and escape using a parachute.",
  "forms": [
    {
      "form": "Cooper vanes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Cooper vane (plural Cooper vanes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "en:Aviation"
      ],
      "glosses": [
        "A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight."
      ],
      "links": [
        [
          "aviation",
          "aviation"
        ],
        [
          "mechanical",
          "mechanical"
        ],
        [
          "aerodynamic",
          "aerodynamic"
        ],
        [
          "wedge",
          "wedge"
        ],
        [
          "ventral",
          "ventral"
        ],
        [
          "airstair",
          "airstair"
        ],
        [
          "aircraft",
          "aircraft"
        ],
        [
          "lower",
          "lower"
        ],
        [
          "flight",
          "flight"
        ]
      ],
      "raw_glosses": [
        "(aviation) A mechanical aerodynamic wedge that prevents the ventral airstair of an aircraft from being lowered during flight."
      ],
      "topics": [
        "aeronautics",
        "aerospace",
        "aviation",
        "business",
        "engineering",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "D. B. Cooper"
      ]
    }
  ],
  "word": "Cooper vane"
}