"Oppel-Kundt illusion" meaning in All languages combined

{
  "etymology_text": "Named after German physicists Johann Joseph Oppel and August Kundt.",
  "forms": [
    {
      "form": "Oppel-Kundt illusions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Oppel-Kundt illusion (plural Oppel-Kundt illusions)",
      "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 entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
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        },
        {
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Optical illusions",
          "orig": "en:Optical illusions",
          "parents": [
            "Vision",
            "Senses",
            "Perception",
            "Body",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "An optical illusion that occurs when comparing the sizes of filled and unfilled parts of an image."
      ],
      "id": "en-Oppel-Kundt_illusion-en-noun-IEluEIO1",
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ]
      ]
    }
  ],
  "word": "Oppel-Kundt illusion"
}

{
  "etymology_text": "Named after German physicists Johann Joseph Oppel and August Kundt.",
  "forms": [
    {
      "form": "Oppel-Kundt illusions",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "Oppel-Kundt illusion (plural Oppel-Kundt illusions)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English eponyms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with non-redundant non-automated sortkeys",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Optical illusions"
      ],
      "glosses": [
        "An optical illusion that occurs when comparing the sizes of filled and unfilled parts of an image."
      ],
      "links": [
        [
          "optical illusion",
          "optical illusion"
        ]
      ]
    }
  ],
  "word": "Oppel-Kundt illusion"
}