"atomic radius" meaning in English

{
  "forms": [
    {
      "form": "atomic radii",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "atomic radii"
      },
      "expansion": "atomic radius (plural atomic radii)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
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          "source": "w"
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        {
          "kind": "other",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The distance from the center of the nucleus to the outermost electron in an atom."
      ],
      "id": "en-atomic_radius-en-noun-IU4rME9r",
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "nucleus",
          "nucleus"
        ],
        [
          "electron",
          "electron"
        ],
        [
          "atom",
          "atom"
        ]
      ],
      "raw_glosses": [
        "(physics) The distance from the center of the nucleus to the outermost electron in an atom."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ],
      "translations": [
        {
          "code": "el",
          "lang": "Greek",
          "lang_code": "el",
          "roman": "atomikí aktína",
          "sense": "Translations",
          "tags": [
            "feminine"
          ],
          "word": "ατομική ακτίνα"
        }
      ]
    }
  ],
  "word": "atomic radius"
}

{
  "forms": [
    {
      "form": "atomic radii",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "atomic radii"
      },
      "expansion": "atomic radius (plural atomic radii)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English multiword terms",
        "English nouns",
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        "Pages with 1 entry",
        "Pages with entries",
        "Terms with Greek translations",
        "Translation table header lacks gloss",
        "en:Physics"
      ],
      "glosses": [
        "The distance from the center of the nucleus to the outermost electron in an atom."
      ],
      "links": [
        [
          "physics",
          "physics"
        ],
        [
          "nucleus",
          "nucleus"
        ],
        [
          "electron",
          "electron"
        ],
        [
          "atom",
          "atom"
        ]
      ],
      "raw_glosses": [
        "(physics) The distance from the center of the nucleus to the outermost electron in an atom."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "translations": [
    {
      "code": "el",
      "lang": "Greek",
      "lang_code": "el",
      "roman": "atomikí aktína",
      "sense": "Translations",
      "tags": [
        "feminine"
      ],
      "word": "ατομική ακτίνα"
    }
  ],
  "word": "atomic radius"
}