"pseudospectrum" meaning in English

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  "etymology_text": "pseudo- + spectrum",
  "forms": [
    {
      "form": "pseudospectra",
      "tags": [
        "plural"
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  "lang_code": "en",
  "pos": "noun",
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          "name": "Mathematics",
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      "glosses": [
        "A set containing the spectrum of an operator and the numbers that are \"almost\" eigenvalues."
      ],
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          "eigenvalue",
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      ],
      "raw_glosses": [
        "(mathematics) A set containing the spectrum of an operator and the numbers that are \"almost\" eigenvalues."
      ],
      "related": [
        {
          "word": "pseudospectral"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ],
      "wikipedia": [
        "pseudospectrum"
      ]
    }
  ],
  "word": "pseudospectrum"
}

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      "expansion": "pseudo- + spectrum",
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  ],
  "etymology_text": "pseudo- + spectrum",
  "forms": [
    {
      "form": "pseudospectra",
      "tags": [
        "plural"
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    }
  ],
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "pseudospectral"
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        "A set containing the spectrum of an operator and the numbers that are \"almost\" eigenvalues."
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        "(mathematics) A set containing the spectrum of an operator and the numbers that are \"almost\" eigenvalues."
      ],
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        "mathematics",
        "sciences"
      ],
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        "pseudospectrum"
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