"bleu pétrole" meaning in French

{
  "head_templates": [
    {
      "args": {
        "inv": "1"
      },
      "expansion": "bleu pétrole (invariable)",
      "name": "fr-adj"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Blues",
          "orig": "fr:Blues",
          "parents": [
            "Colors",
            "Light",
            "Vision",
            "Energy",
            "Senses",
            "Nature",
            "Perception",
            "All topics",
            "Body",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "of a dark blue green colour"
      ],
      "id": "en-bleu_pétrole-fr-adj-sAJgIkz6",
      "links": [
        [
          "blue green",
          "blue green"
        ]
      ],
      "tags": [
        "invariable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/blø pe.tʁɔl/"
    },
    {
      "audio": "LL-Q150 (fra)-Lyokoï-bleu pétrole.wav",
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    }
  ],
  "word": "bleu pétrole"
}

{
  "head_templates": [
    {
      "args": {
        "inv": "1"
      },
      "expansion": "bleu pétrole (invariable)",
      "name": "fr-adj"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "French adjectives",
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Blues"
      ],
      "glosses": [
        "of a dark blue green colour"
      ],
      "links": [
        [
          "blue green",
          "blue green"
        ]
      ],
      "tags": [
        "invariable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/blø pe.tʁɔl/"
    },
    {
      "audio": "LL-Q150 (fra)-Lyokoï-bleu pétrole.wav",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/6/6e/LL-Q150_%28fra%29-Lyoko%C3%AF-bleu_p%C3%A9trole.wav/LL-Q150_%28fra%29-Lyoko%C3%AF-bleu_p%C3%A9trole.wav.mp3",
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    }
  ],
  "word": "bleu pétrole"
}