"hidr-" meaning in Galician

{
  "etymology_templates": [
    {
      "args": {
        "1": "gl",
        "2": "grc",
        "3": "ὑδρο-"
      },
      "expansion": "Ancient Greek ὑδρο- (hudro-)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek ὑδρο- (hudro-), from ὕδωρ (húdōr, “water”).",
  "head_templates": [
    {
      "args": {
        "1": "gl",
        "2": "prefix"
      },
      "expansion": "hidr-",
      "name": "head"
    }
  ],
  "lang": "Galician",
  "lang_code": "gl",
  "pos": "prefix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "hidro-"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Galician entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Alternative form of hidro-"
      ],
      "id": "en-hidr--gl-prefix-lMTHL4Z7",
      "links": [
        [
          "hidro-",
          "hidro-#Galician"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "hidr-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "gl",
        "2": "grc",
        "3": "ὑδρο-"
      },
      "expansion": "Ancient Greek ὑδρο- (hudro-)",
      "name": "der"
    }
  ],
  "etymology_text": "From Ancient Greek ὑδρο- (hudro-), from ὕδωρ (húdōr, “water”).",
  "head_templates": [
    {
      "args": {
        "1": "gl",
        "2": "prefix"
      },
      "expansion": "hidr-",
      "name": "head"
    }
  ],
  "lang": "Galician",
  "lang_code": "gl",
  "pos": "prefix",
  "senses": [
    {
      "alt_of": [
        {
          "word": "hidro-"
        }
      ],
      "categories": [
        "Galician entries with incorrect language header",
        "Galician lemmas",
        "Galician prefixes",
        "Galician terms derived from Ancient Greek"
      ],
      "glosses": [
        "Alternative form of hidro-"
      ],
      "links": [
        [
          "hidro-",
          "hidro-#Galician"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative",
        "morpheme"
      ]
    }
  ],
  "word": "hidr-"
}