"21-gon" meaning in English

{
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        "2": "21",
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      "expansion": "21 + -gon",
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  ],
  "etymology_text": "From 21 + -gon.",
  "forms": [
    {
      "form": "21-gons",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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      "expansion": "21-gon (plural 21-gons)",
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  ],
  "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"
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          "source": "w"
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          "kind": "other",
          "name": "English numeronyms",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms suffixed with -gon",
          "parents": [],
          "source": "w"
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        {
          "kind": "other",
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          "langcode": "en",
          "name": "Geometry",
          "orig": "en:Geometry",
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            "Formal sciences",
            "Sciences",
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            "Fundamental"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Polygons",
          "orig": "en:Polygons",
          "parents": [
            "Shapes",
            "Geometry",
            "Mathematics",
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of icosihenagon: A polygon with twenty-one edges and twenty-one angles."
      ],
      "id": "en-21-gon-en-noun-lbmZ8fZM",
      "links": [
        [
          "geometry",
          "geometry"
        ],
        [
          "icosihenagon",
          "icosihenagon#English"
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        [
          "polygon",
          "polygon"
        ],
        [
          "twenty-one",
          "twenty-one"
        ]
      ],
      "raw_glosses": [
        "(geometry) Synonym of icosihenagon: A polygon with twenty-one edges and twenty-one angles."
      ],
      "synonyms": [
        {
          "extra": "A polygon with twenty-one edges and twenty-one angles",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "icosihenagon"
        }
      ],
      "topics": [
        "geometry",
        "mathematics",
        "sciences"
      ]
    }
  ],
  "word": "21-gon"
}

{
  "etymology_templates": [
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        "2": "21",
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      },
      "expansion": "21 + -gon",
      "name": "suffix"
    }
  ],
  "etymology_text": "From 21 + -gon.",
  "forms": [
    {
      "form": "21-gons",
      "tags": [
        "plural"
      ]
    }
  ],
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      ],
      "glosses": [
        "Synonym of icosihenagon: A polygon with twenty-one edges and twenty-one angles."
      ],
      "links": [
        [
          "geometry",
          "geometry"
        ],
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          "icosihenagon",
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        ],
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        ],
        [
          "twenty-one",
          "twenty-one"
        ]
      ],
      "raw_glosses": [
        "(geometry) Synonym of icosihenagon: A polygon with twenty-one edges and twenty-one angles."
      ],
      "synonyms": [
        {
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          "tags": [
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    }
  ],
  "word": "21-gon"
}