"nhị trùng âm" meaning in Vietnamese

{
  "etymology_templates": [
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        "2": "二重音",
        "t": ""
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      "expansion": "二重音",
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    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
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      "expansion": "",
      "name": "categorize"
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    {
      "args": {
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      "expansion": "Sino-Vietnamese word from 二重音",
      "name": "vi-etym-sino"
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  ],
  "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": "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": "other",
          "name": "Vietnamese nouns without classifiers",
          "parents": [],
          "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"
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      ],
      "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˧˧]",
      "tags": [
        "Hồ-Chí-Minh-City"
      ]
    }
  ],
  "word": "nhị trùng âm"
}

{
  "etymology_templates": [
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      "args": {
        "1": "vi",
        "2": "二重音",
        "t": ""
      },
      "expansion": "二重音",
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    },
    {
      "args": {
        "1": "vi",
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      },
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      },
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      "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": [
        "Sino-Vietnamese words",
        "Sino-Vietnamese words with uncreated Han etymology",
        "Vietnamese entries with incorrect language header",
        "Vietnamese lemmas",
        "Vietnamese nouns",
        "Vietnamese nouns without classifiers",
        "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˧˧]",
      "tags": [
        "Hồ-Chí-Minh-City"
      ]
    }
  ],
  "word": "nhị trùng âm"
}