"rayonnement fossile" meaning in Français

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  "etymology_texts": [
    "Locution composée de rayonnement et de fossile."
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
      "categories": [
        {
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          "name": "Lexique en français de l’astrophysique",
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        }
      ],
      "glosses": [
        "Rayonnement électromagnétique, homogène et isotrope, provenant des premiers instants de l’Univers."
      ],
      "id": "fr-rayonnement_fossile-fr-noun-edR4XvZm",
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        "astrophysics"
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      "ipa": "\\ʁɛ.jɔn.mɑ̃ fo.sil\\"
    },
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  "synonyms": [
    {
      "word": "fond diffus cosmologique"
    }
  ],
  "tags": [
    "masculine",
    "singular-only"
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  "translations": [
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "cosmic microwave background"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "CMB"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "cosmic microwave background radiation"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "CMBR"
    }
  ],
  "word": "rayonnement fossile"
}

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  "etymology_texts": [
    "Locution composée de rayonnement et de fossile."
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "senses": [
    {
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        "Rayonnement électromagnétique, homogène et isotrope, provenant des premiers instants de l’Univers."
      ],
      "topics": [
        "astrophysics"
      ]
    }
  ],
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    "masculine",
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    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "cosmic microwave background"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "CMB"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "cosmic microwave background radiation"
    },
    {
      "lang": "Anglais",
      "lang_code": "en",
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  ],
  "word": "rayonnement fossile"
}