"feu follet" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "feu",
        "3": "follet",
        "t1": "fire",
        "t2": "sprite"
      },
      "expansion": "feu (“fire”) + follet (“sprite”)",
      "name": "af"
    }
  ],
  "etymology_text": "From feu (“fire”) + follet (“sprite”).",
  "forms": [
    {
      "form": "feux follets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "feux follets"
      },
      "expansion": "feu follet m (plural feux follets)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "atmospheric ghost light"
      ],
      "id": "en-feu_follet-fr-noun-sC9Y4a8E",
      "links": [
        [
          "ghost light",
          "ghost light"
        ]
      ],
      "synonyms": [
        {
          "word": "flammerole"
        }
      ],
      "tags": [
        "masculine"
      ]
    },
    {
      "categories": [
        {
          "_dis": "12 88",
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "42 58",
          "kind": "topical",
          "langcode": "fr",
          "name": "Fire",
          "orig": "fr:Fire",
          "parents": [
            "Combustion",
            "Light sources",
            "Chemical processes",
            "Light",
            "Nature",
            "Energy",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "7 93",
          "kind": "topical",
          "langcode": "fr",
          "name": "Mythological creatures",
          "orig": "fr:Mythological creatures",
          "parents": [
            "Fantasy",
            "Mythology",
            "Fiction",
            "Speculative fiction",
            "Culture",
            "Artistic works",
            "Genres",
            "Society",
            "Art",
            "Entertainment",
            "All topics",
            "Fundamental"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "will-o'-the-wisp"
      ],
      "id": "en-feu_follet-fr-noun-ucmYXrKa",
      "links": [
        [
          "folklore",
          "folklore"
        ],
        [
          "will-o'-the-wisp",
          "will-o'-the-wisp"
        ]
      ],
      "raw_glosses": [
        "(folklore) will-o'-the-wisp"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "arts",
        "folklore",
        "history",
        "human-sciences",
        "literature",
        "media",
        "publishing",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/fø fɔ.lɛ/"
    }
  ],
  "wikipedia": [
    "fr:feu follet"
  ],
  "word": "feu follet"
}

{
  "categories": [
    "French compound terms",
    "French countable nouns",
    "French entries with incorrect language header",
    "French lemmas",
    "French masculine nouns",
    "French multiword terms",
    "French nouns",
    "French terms with IPA pronunciation",
    "fr:Fire",
    "fr:Mythological creatures"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "feu",
        "3": "follet",
        "t1": "fire",
        "t2": "sprite"
      },
      "expansion": "feu (“fire”) + follet (“sprite”)",
      "name": "af"
    }
  ],
  "etymology_text": "From feu (“fire”) + follet (“sprite”).",
  "forms": [
    {
      "form": "feux follets",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m",
        "2": "feux follets"
      },
      "expansion": "feu follet m (plural feux follets)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "atmospheric ghost light"
      ],
      "links": [
        [
          "ghost light",
          "ghost light"
        ]
      ],
      "synonyms": [
        {
          "word": "flammerole"
        }
      ],
      "tags": [
        "masculine"
      ]
    },
    {
      "glosses": [
        "will-o'-the-wisp"
      ],
      "links": [
        [
          "folklore",
          "folklore"
        ],
        [
          "will-o'-the-wisp",
          "will-o'-the-wisp"
        ]
      ],
      "raw_glosses": [
        "(folklore) will-o'-the-wisp"
      ],
      "tags": [
        "masculine"
      ],
      "topics": [
        "arts",
        "folklore",
        "history",
        "human-sciences",
        "literature",
        "media",
        "publishing",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/fø fɔ.lɛ/"
    }
  ],
  "wikipedia": [
    "fr:feu follet"
  ],
  "word": "feu follet"
}