"FdD" meaning in French

{
  "head_templates": [
    {
      "args": {
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      "expansion": "FdD f pl (plural only)",
      "name": "fr-proper noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "literally “Excavations from Delphi”",
          "word": "Fouilles de Delphes"
        }
      ],
      "categories": [
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          "source": "w"
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          "kind": "other",
          "name": "French pluralia tantum",
          "parents": [
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            "Nouns",
            "Lemmas"
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          "source": "w"
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        {
          "kind": "other",
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          "source": "w"
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        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Bibliography",
          "orig": "fr:Bibliography",
          "parents": [
            "Books",
            "Literature",
            "Mass media",
            "Culture",
            "Entertainment",
            "Writing",
            "Media",
            "Society",
            "Human behaviour",
            "Language",
            "Communication",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Initialism of Fouilles de Delphes (literally “Excavations from Delphi”)."
      ],
      "id": "en-FdD-fr-name-WP~Oz2Gd",
      "links": [
        [
          "bibliography",
          "bibliography"
        ]
      ],
      "raw_glosses": [
        "(bibliography) Initialism of Fouilles de Delphes (literally “Excavations from Delphi”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "feminine",
        "initialism",
        "plural",
        "plural-only"
      ],
      "topics": [
        "bibliography",
        "computing",
        "engineering",
        "human-sciences",
        "information-science",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "FdD"
}

{
  "head_templates": [
    {
      "args": {
        "1": "f-p"
      },
      "expansion": "FdD f pl (plural only)",
      "name": "fr-proper noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "name",
  "senses": [
    {
      "alt_of": [
        {
          "extra": "literally “Excavations from Delphi”",
          "word": "Fouilles de Delphes"
        }
      ],
      "categories": [
        "French entries with incorrect language header",
        "French feminine nouns",
        "French initialisms",
        "French lemmas",
        "French pluralia tantum",
        "French proper nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Bibliography"
      ],
      "glosses": [
        "Initialism of Fouilles de Delphes (literally “Excavations from Delphi”)."
      ],
      "links": [
        [
          "bibliography",
          "bibliography"
        ]
      ],
      "raw_glosses": [
        "(bibliography) Initialism of Fouilles de Delphes (literally “Excavations from Delphi”)."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "feminine",
        "initialism",
        "plural",
        "plural-only"
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      "topics": [
        "bibliography",
        "computing",
        "engineering",
        "human-sciences",
        "information-science",
        "mathematics",
        "natural-sciences",
        "physical-sciences",
        "sciences"
      ]
    }
  ],
  "word": "FdD"
}