"pseudotriangle" meaning in English

{
  "etymology_templates": [
    {
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        "2": "pseudo",
        "3": "triangle"
      },
      "expansion": "pseudo- + triangle",
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    }
  ],
  "etymology_text": "pseudo- + triangle",
  "forms": [
    {
      "form": "pseudotriangles",
      "tags": [
        "plural"
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  ],
  "head_templates": [
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      "args": {},
      "expansion": "pseudotriangle (plural pseudotriangles)",
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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",
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          "source": "w"
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        {
          "kind": "other",
          "name": "English terms prefixed with pseudo-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Mathematics",
          "orig": "en:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
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            "Fundamental"
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          "source": "w"
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      ],
      "glosses": [
        "Any subset of a plane that lies between any three mutually tangent convex sets"
      ],
      "id": "en-pseudotriangle-en-noun-lvi-7pIb",
      "links": [
        [
          "mathematics",
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          "subset",
          "subset"
        ],
        [
          "plane",
          "plane"
        ],
        [
          "tangent",
          "tangent"
        ],
        [
          "convex set",
          "convex set"
        ]
      ],
      "raw_glosses": [
        "(mathematics) Any subset of a plane that lies between any three mutually tangent convex sets"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "pseudotriangle"
      ]
    }
  ],
  "word": "pseudotriangle"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "pseudo",
        "3": "triangle"
      },
      "expansion": "pseudo- + triangle",
      "name": "prefix"
    }
  ],
  "etymology_text": "pseudo- + triangle",
  "forms": [
    {
      "form": "pseudotriangles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "pseudotriangle (plural pseudotriangles)",
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  "lang_code": "en",
  "pos": "noun",
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        "Any subset of a plane that lies between any three mutually tangent convex sets"
      ],
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        [
          "mathematics",
          "mathematics"
        ],
        [
          "subset",
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        "(mathematics) Any subset of a plane that lies between any three mutually tangent convex sets"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "pseudotriangle"
      ]
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  "word": "pseudotriangle"
}