"diftongs" meaning in Catalan

{
  "head_templates": [
    {
      "args": {
        "1": "ca",
        "2": "noun form"
      },
      "expansion": "diftongs",
      "name": "head"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Catalan entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 3 entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "diftong"
        }
      ],
      "glosses": [
        "plural of diftong"
      ],
      "id": "en-diftongs-ca-noun-9bu4cvaT",
      "links": [
        [
          "diftong",
          "diftong#Catalan"
        ]
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "word": "diftongs"
}

{
  "head_templates": [
    {
      "args": {
        "1": "ca",
        "2": "noun form"
      },
      "expansion": "diftongs",
      "name": "head"
    }
  ],
  "lang": "Catalan",
  "lang_code": "ca",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Catalan entries with incorrect language header",
        "Catalan non-lemma forms",
        "Catalan noun forms",
        "Pages with 3 entries"
      ],
      "form_of": [
        {
          "word": "diftong"
        }
      ],
      "glosses": [
        "plural of diftong"
      ],
      "links": [
        [
          "diftong",
          "diftong#Catalan"
        ]
      ],
      "tags": [
        "form-of",
        "plural"
      ]
    }
  ],
  "word": "diftongs"
}