"tétra-" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "grc",
        "3": "τετρα-",
        "t": "four"
      },
      "expansion": "Ancient Greek τετρα- (tetra-, “four”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek τετρα- (tetra-, “four”).",
  "head_templates": [
    {
      "args": {},
      "expansion": "tétra-",
      "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 with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Four",
          "orig": "fr:Four",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "tetra-"
      ],
      "id": "en-tétra--fr-prefix-i3YIyLny",
      "links": [
        [
          "tetra-",
          "tetra-"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/te.tʁa/"
    }
  ],
  "word": "tétra-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "grc",
        "3": "τετρα-",
        "t": "four"
      },
      "expansion": "Ancient Greek τετρα- (tetra-, “four”)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek τετρα- (tetra-, “four”).",
  "head_templates": [
    {
      "args": {},
      "expansion": "tétra-",
      "name": "fr-prefix"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "French 2-syllable words",
        "French entries with incorrect language header",
        "French lemmas",
        "French prefixes",
        "French terms derived from Ancient Greek",
        "French terms with IPA pronunciation",
        "Pages with 1 entry",
        "Pages with entries",
        "fr:Four"
      ],
      "glosses": [
        "tetra-"
      ],
      "links": [
        [
          "tetra-",
          "tetra-"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/te.tʁa/"
    }
  ],
  "word": "tétra-"
}