"anti-down quark" meaning in English

{
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    {
      "form": "anti-down quarks",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Quarks",
          "orig": "en:Quarks",
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      ],
      "glosses": [
        "The antiquark corresponding to the down quark."
      ],
      "id": "en-anti-down_quark-en-noun-SL8zn92W",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "antiquark",
          "antiquark"
        ],
        [
          "down quark",
          "down quark"
        ]
      ],
      "raw_glosses": [
        "(physics) The antiquark corresponding to the down quark."
      ],
      "related": [
        {
          "word": "up quark"
        },
        {
          "word": "down quark"
        },
        {
          "word": "charm quark"
        },
        {
          "word": "strange quark"
        },
        {
          "word": "top quark"
        },
        {
          "word": "truth quark"
        },
        {
          "word": "bottom quark"
        },
        {
          "word": "beauty quark"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "the antiquark corresponding to the down quark",
          "word": "alas-antikvarkki"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "the antiquark corresponding to the down quark",
          "tags": [
            "masculine"
          ],
          "word": "antiquark down"
        },
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "the antiquark corresponding to the down quark",
          "tags": [
            "common-gender"
          ],
          "word": "antinedkvark"
        }
      ]
    }
  ],
  "word": "anti-down quark"
}

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      "form": "anti-down quarks",
      "tags": [
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "up quark"
    },
    {
      "word": "down quark"
    },
    {
      "word": "charm quark"
    },
    {
      "word": "strange quark"
    },
    {
      "word": "top quark"
    },
    {
      "word": "truth quark"
    },
    {
      "word": "bottom quark"
    },
    {
      "word": "beauty quark"
    }
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      "glosses": [
        "The antiquark corresponding to the down quark."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "antiquark",
          "antiquark"
        ],
        [
          "down quark",
          "down quark"
        ]
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      "raw_glosses": [
        "(physics) The antiquark corresponding to the down quark."
      ],
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        "natural-sciences",
        "physical-sciences",
        "physics"
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  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "the antiquark corresponding to the down quark",
      "word": "alas-antikvarkki"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "the antiquark corresponding to the down quark",
      "tags": [
        "masculine"
      ],
      "word": "antiquark down"
    },
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "the antiquark corresponding to the down quark",
      "tags": [
        "common-gender"
      ],
      "word": "antinedkvark"
    }
  ],
  "word": "anti-down quark"
}