"nhị trùng âm" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "二重音"
      },
      "expansion": "Sino-Vietnamese word from 二重音",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 二重音.",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "nhị trùng âm",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "nhị trùng âm",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Sino-Vietnamese words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Sino-Vietnamese words with uncreated Han etymology",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "vi",
          "name": "Linguistics",
          "orig": "vi:Linguistics",
          "parents": [
            "Language",
            "Social sciences",
            "Communication",
            "Sciences",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "diphthong"
      ],
      "id": "en-nhị_trùng_âm-vi-noun-jb1ocCtv",
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "diphthong",
          "diphthong"
        ]
      ],
      "raw_glosses": [
        "(uncommon, linguistics) diphthong"
      ],
      "synonyms": [
        {
          "word": "nguyên âm đôi"
        }
      ],
      "tags": [
        "uncommon"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɲi˧˨ʔ t͡ɕʊwŋ͡m˨˩ ʔəm˧˧]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ɲɪj˨˩ʔ ʈʊwŋ͡m˦˩ ʔəm˧˧]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ɲɪj˨˩˨ ʈʊwŋ͡m˨˩ ʔəm˧˧]",
      "note": "Saigon"
    }
  ],
  "word": "nhị trùng âm"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "二重音"
      },
      "expansion": "Sino-Vietnamese word from 二重音",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 二重音.",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "nhị trùng âm",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "nhị trùng âm",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Sino-Vietnamese words",
        "Sino-Vietnamese words with uncreated Han etymology",
        "Vietnamese entries with incorrect language header",
        "Vietnamese lemmas",
        "Vietnamese nouns",
        "Vietnamese terms with IPA pronunciation",
        "Vietnamese terms with uncommon senses",
        "vi:Linguistics"
      ],
      "glosses": [
        "diphthong"
      ],
      "links": [
        [
          "linguistics",
          "linguistics"
        ],
        [
          "diphthong",
          "diphthong"
        ]
      ],
      "raw_glosses": [
        "(uncommon, linguistics) diphthong"
      ],
      "synonyms": [
        {
          "word": "nguyên âm đôi"
        }
      ],
      "tags": [
        "uncommon"
      ],
      "topics": [
        "human-sciences",
        "linguistics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɲi˧˨ʔ t͡ɕʊwŋ͡m˨˩ ʔəm˧˧]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[ɲɪj˨˩ʔ ʈʊwŋ͡m˦˩ ʔəm˧˧]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[ɲɪj˨˩˨ ʈʊwŋ͡m˨˩ ʔəm˧˧]",
      "note": "Saigon"
    }
  ],
  "word": "nhị trùng âm"
}