"piro-" meaning in Catalan

{
  "etymology_templates": [
    {
      "args": {
        "1": "ca",
        "2": "grc",
        "3": "πυρο-"
      },
      "expansion": "Ancient Greek πυρο- (puro-)",
      "name": "der"
    },
    {
      "args": {
        "1": "grc",
        "2": "πῦρ",
        "t": "fire"
      },
      "expansion": "πῦρ (pûr, “fire”)",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek πυρο- (puro-), combining form of πῦρ (pûr, “fire”).",
  "head_templates": [
    {
      "args": {
        "1": "ca",
        "2": "prefix"
      },
      "expansion": "piro-",
      "name": "head"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Catalan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ca",
          "name": "Fire",
          "orig": "ca:Fire",
          "parents": [
            "Combustion",
            "Light sources",
            "Chemical processes",
            "Light",
            "Nature",
            "Energy",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "pyro-"
      ],
      "id": "en-piro--ca-prefix-Ba372hH6",
      "links": [
        [
          "pyro-",
          "pyro-"
        ]
      ],
      "synonyms": [
        {
          "word": "pir- before a vowel"
        }
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "piro-"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "ca",
        "2": "grc",
        "3": "πυρο-"
      },
      "expansion": "Ancient Greek πυρο- (puro-)",
      "name": "der"
    },
    {
      "args": {
        "1": "grc",
        "2": "πῦρ",
        "t": "fire"
      },
      "expansion": "πῦρ (pûr, “fire”)",
      "name": "m"
    }
  ],
  "etymology_text": "From Ancient Greek πυρο- (puro-), combining form of πῦρ (pûr, “fire”).",
  "head_templates": [
    {
      "args": {
        "1": "ca",
        "2": "prefix"
      },
      "expansion": "piro-",
      "name": "head"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Catalan entries with incorrect language header",
        "Catalan lemmas",
        "Catalan prefixes",
        "Catalan terms derived from Ancient Greek",
        "ca:Fire"
      ],
      "glosses": [
        "pyro-"
      ],
      "links": [
        [
          "pyro-",
          "pyro-"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "pir- before a vowel"
    }
  ],
  "word": "piro-"
}