"toponium" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "top",
        "3": "onium"
      },
      "expansion": "top + -onium",
      "name": "suffix"
    }
  ],
  "etymology_text": "top + -onium From top quark and \"-onium\" as in positronium.",
  "forms": [
    {
      "form": "toponiums",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "toponia",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s",
        "2": "toponia"
      },
      "expansion": "toponium (plural toponiums or toponia)",
      "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 terms suffixed with -onium",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with French translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Russian translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Antimatter",
          "orig": "en:Antimatter",
          "parents": [
            "Matter",
            "Chemistry",
            "Nature",
            "Sciences",
            "All topics",
            "Fundamental"
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          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Subatomic particles",
          "orig": "en:Subatomic particles",
          "parents": [
            "Matter",
            "Particle physics",
            "Chemistry",
            "Nature",
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark"
      ],
      "id": "en-toponium-en-noun-Jsj-atOj",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "meson",
          "meson"
        ],
        [
          "top quark",
          "top quark"
        ],
        [
          "antiquark",
          "antiquark"
        ]
      ],
      "raw_glosses": [
        "(physics) Any hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark"
      ],
      "related": [
        {
          "word": "bottomonium"
        },
        {
          "word": "quarkonium"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "hypothetical meson",
          "tags": [
            "masculine"
          ],
          "word": "toponium"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "topónij",
          "sense": "hypothetical meson",
          "tags": [
            "masculine"
          ],
          "word": "топо́ний"
        }
      ]
    }
  ],
  "word": "toponium"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "top",
        "3": "onium"
      },
      "expansion": "top + -onium",
      "name": "suffix"
    }
  ],
  "etymology_text": "top + -onium From top quark and \"-onium\" as in positronium.",
  "forms": [
    {
      "form": "toponiums",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "toponia",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s",
        "2": "toponia"
      },
      "expansion": "toponium (plural toponiums or toponia)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "bottomonium"
    },
    {
      "word": "quarkonium"
    }
  ],
  "senses": [
    {
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        "English terms suffixed with -onium",
        "Terms with French translations",
        "Terms with Russian translations",
        "en:Antimatter",
        "en:Subatomic particles"
      ],
      "glosses": [
        "Any hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "meson",
          "meson"
        ],
        [
          "top quark",
          "top quark"
        ],
        [
          "antiquark",
          "antiquark"
        ]
      ],
      "raw_glosses": [
        "(physics) Any hypothetical meson formed from a top quark and its antiquark; would be very unstable because of the large mass of the top quark"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "hypothetical meson",
      "tags": [
        "masculine"
      ],
      "word": "toponium"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "topónij",
      "sense": "hypothetical meson",
      "tags": [
        "masculine"
      ],
      "word": "топо́ний"
    }
  ],
  "word": "toponium"
}