"paléo-" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "grc",
        "3": "παλαιός",
        "4": "",
        "5": "old"
      },
      "expansion": "Ancient Greek παλαιός (palaiós, “old”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek παλαιός (palaiós, “old”).",
  "head_templates": [
    {
      "args": {},
      "expansion": "paléo-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "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 using catfix",
          "parents": [],
          "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": "Paleontology",
          "orig": "fr:Paleontology",
          "parents": [
            "Geology",
            "Sciences",
            "Earth sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "paleo-"
      ],
      "id": "en-paléo--fr-prefix-BWBb-nOd",
      "links": [
        [
          "paleo-",
          "paleo-"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "paléo-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "grc",
        "3": "παλαιός",
        "4": "",
        "5": "old"
      },
      "expansion": "Ancient Greek παλαιός (palaiós, “old”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek παλαιός (palaiós, “old”).",
  "head_templates": [
    {
      "args": {},
      "expansion": "paléo-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "French entries with incorrect language header",
        "French lemmas",
        "French prefixes",
        "French terms derived from Ancient Greek",
        "Pages using catfix",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Paleontology"
      ],
      "glosses": [
        "paleo-"
      ],
      "links": [
        [
          "paleo-",
          "paleo-"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "paléo-"
}