"Wien approximation" meaning in English

{
  "etymology_text": "First derived by Wilhelm Wien in 1896.",
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  "lang_code": "en",
  "pos": "name",
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      "glosses": [
        "A law of physics used to describe the spectrum of thermal radiation."
      ],
      "id": "en-Wien_approximation-en-name-EE5r1c~s",
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          "physics",
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          "law",
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          "spectrum",
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        [
          "thermal radiation",
          "thermal radiation"
        ]
      ],
      "raw_glosses": [
        "(physics) A law of physics used to describe the spectrum of thermal radiation."
      ],
      "related": [
        {
          "word": "Wien distribution law"
        },
        {
          "word": "Wien's law"
        }
      ],
      "synonyms": [
        {
          "word": "Wien's approximation"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "Wien approximation"
}

{
  "etymology_text": "First derived by Wilhelm Wien in 1896.",
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      "expansion": "Wien approximation",
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  "lang": "English",
  "lang_code": "en",
  "pos": "name",
  "related": [
    {
      "word": "Wien distribution law"
    },
    {
      "word": "Wien's law"
    }
  ],
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        "en:Physics"
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      "glosses": [
        "A law of physics used to describe the spectrum of thermal radiation."
      ],
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          "physics",
          "physics"
        ],
        [
          "law",
          "law"
        ],
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          "spectrum",
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        ],
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          "thermal radiation",
          "thermal radiation"
        ]
      ],
      "raw_glosses": [
        "(physics) A law of physics used to describe the spectrum of thermal radiation."
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Wien's approximation"
    }
  ],
  "word": "Wien approximation"
}