"luminiferous aether" meaning in English

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      "expansion": "luminiferous aether (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Physics",
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      ],
      "glosses": [
        "The supposed medium through which light is transmitted"
      ],
      "id": "en-luminiferous_aether-en-noun-45H4EQoT",
      "links": [
        [
          "physics",
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      "raw_glosses": [
        "(historical, physics) The supposed medium through which light is transmitted"
      ],
      "synonyms": [
        {
          "word": "luminiferous ether"
        }
      ],
      "tags": [
        "historical",
        "uncountable"
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      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
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      "translations": [
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "efír",
          "sense": "Translations",
          "word": "эфи́р"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "svetonósnyj efír",
          "sense": "Translations",
          "word": "светоно́сный эфи́р"
        }
      ]
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  ],
  "word": "luminiferous aether"
}

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  "lang_code": "en",
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        "en:Physics"
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      "glosses": [
        "The supposed medium through which light is transmitted"
      ],
      "links": [
        [
          "physics",
          "physics"
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      ],
      "raw_glosses": [
        "(historical, physics) The supposed medium through which light is transmitted"
      ],
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        "historical",
        "uncountable"
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        "natural-sciences",
        "physical-sciences",
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  "synonyms": [
    {
      "word": "luminiferous ether"
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  ],
  "translations": [
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      "lang": "Russian",
      "roman": "efír",
      "sense": "Translations",
      "word": "эфи́р"
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    {
      "code": "ru",
      "lang": "Russian",
      "roman": "svetonósnyj efír",
      "sense": "Translations",
      "word": "светоно́сный эфи́р"
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  "word": "luminiferous aether"
}