"antimuonium" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "anti",
        "3": "muonium"
      },
      "expansion": "anti- + muonium",
      "name": "prefix"
    }
  ],
  "etymology_text": "anti- + muonium",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "antimuonium (uncountable)",
      "name": "en-noun"
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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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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with anti-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Subatomic particles",
          "orig": "en:Subatomic particles",
          "parents": [
            "Matter",
            "Particle physics",
            "Chemistry",
            "Nature",
            "Physics",
            "Sciences",
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            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "The antimatter form of muonium"
      ],
      "id": "en-antimuonium-en-noun-YiJsHfUR",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "antimatter",
          "antimatter"
        ],
        [
          "muonium",
          "muonium"
        ]
      ],
      "raw_glosses": [
        "(physics) The antimatter form of muonium"
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "antimuonium"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "anti",
        "3": "muonium"
      },
      "expansion": "anti- + muonium",
      "name": "prefix"
    }
  ],
  "etymology_text": "anti- + muonium",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "antimuonium (uncountable)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English lemmas",
        "English nouns",
        "English terms prefixed with anti-",
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      ],
      "glosses": [
        "The antimatter form of muonium"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "antimatter",
          "antimatter"
        ],
        [
          "muonium",
          "muonium"
        ]
      ],
      "raw_glosses": [
        "(physics) The antimatter form of muonium"
      ],
      "tags": [
        "uncountable"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "antimuonium"
}