"vortex line" meaning in English

{
  "forms": [
    {
      "form": "vortex lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "vortex line (plural vortex lines)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "langcode": "en",
          "name": "Fluid dynamics",
          "orig": "en:Fluid dynamics",
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            "Sciences",
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      ],
      "glosses": [
        "A line whose tangent is everywhere parallel to the local vorticity vector."
      ],
      "id": "en-vortex_line-en-noun-1JAN4pYj",
      "links": [
        [
          "fluid dynamics",
          "fluid dynamics"
        ],
        [
          "line",
          "line"
        ],
        [
          "tangent",
          "tangent"
        ],
        [
          "parallel",
          "parallel"
        ],
        [
          "local",
          "local"
        ],
        [
          "vorticity",
          "vorticity"
        ],
        [
          "vector",
          "vector"
        ]
      ],
      "raw_glosses": [
        "(fluid dynamics) A line whose tangent is everywhere parallel to the local vorticity vector."
      ],
      "topics": [
        "fluid-dynamics",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "vortex line"
}

{
  "forms": [
    {
      "form": "vortex lines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "vortex line (plural vortex lines)",
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  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "A line whose tangent is everywhere parallel to the local vorticity vector."
      ],
      "links": [
        [
          "fluid dynamics",
          "fluid dynamics"
        ],
        [
          "line",
          "line"
        ],
        [
          "tangent",
          "tangent"
        ],
        [
          "parallel",
          "parallel"
        ],
        [
          "local",
          "local"
        ],
        [
          "vorticity",
          "vorticity"
        ],
        [
          "vector",
          "vector"
        ]
      ],
      "raw_glosses": [
        "(fluid dynamics) A line whose tangent is everywhere parallel to the local vorticity vector."
      ],
      "topics": [
        "fluid-dynamics",
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "vortex line"
}