"van der Waals radius" meaning in English

{
  "etymology_text": "Named after Johannes Diderik van der Waals, the first to recognise that atoms were not simply points and to demonstrate the physical consequences of their size.",
  "forms": [
    {
      "form": "van der Waals radii",
      "tags": [
        "plural"
      ]
    }
  ],
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      "expansion": "van der Waals radius (plural van der Waals radii)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Physics",
          "orig": "en:Physics",
          "parents": [
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The radius of an imaginary hard sphere representing the distance of closest approach from one atom to another."
      ],
      "id": "en-van_der_Waals_radius-en-noun-UGPsBk7z",
      "links": [
        [
          "physics",
          "physics"
        ]
      ],
      "raw_glosses": [
        "(physics) The radius of an imaginary hard sphere representing the distance of closest approach from one atom to another."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "van der Waals radius"
}

{
  "etymology_text": "Named after Johannes Diderik van der Waals, the first to recognise that atoms were not simply points and to demonstrate the physical consequences of their size.",
  "forms": [
    {
      "form": "van der Waals radii",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "van der Waals radii",
        "head": "van der Waals radius"
      },
      "expansion": "van der Waals radius (plural van der Waals radii)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
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        "en:Physics"
      ],
      "glosses": [
        "The radius of an imaginary hard sphere representing the distance of closest approach from one atom to another."
      ],
      "links": [
        [
          "physics",
          "physics"
        ]
      ],
      "raw_glosses": [
        "(physics) The radius of an imaginary hard sphere representing the distance of closest approach from one atom to another."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "van der Waals radius"
}