"down antiquark" meaning in English

{
  "forms": [
    {
      "form": "down antiquarks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "down antiquark (plural down antiquarks)",
      "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"
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          "source": "w"
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        },
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          "name": "Terms with Swedish translations",
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        },
        {
          "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": [
        "the antiparticle of a down quark"
      ],
      "id": "en-down_antiquark-en-noun-Zqy3UZb2",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "antiparticle",
          "antiparticle"
        ],
        [
          "down quark",
          "down quark"
        ]
      ],
      "raw_glosses": [
        "(physics) the antiparticle of a down quark"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "translations": [
        {
          "code": "sv",
          "lang": "Swedish",
          "sense": "antiparticle of a down quark",
          "tags": [
            "common-gender"
          ],
          "word": "antinedkvark"
        }
      ]
    }
  ],
  "word": "down antiquark"
}

{
  "forms": [
    {
      "form": "down antiquarks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "down antiquark (plural down antiquarks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
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        "English multiword terms",
        "English nouns",
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        "en:Subatomic particles"
      ],
      "glosses": [
        "the antiparticle of a down quark"
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "antiparticle",
          "antiparticle"
        ],
        [
          "down quark",
          "down quark"
        ]
      ],
      "raw_glosses": [
        "(physics) the antiparticle of a down quark"
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "translations": [
    {
      "code": "sv",
      "lang": "Swedish",
      "sense": "antiparticle of a down quark",
      "tags": [
        "common-gender"
      ],
      "word": "antinedkvark"
    }
  ],
  "word": "down antiquark"
}