"古楽器" meaning in Japanese

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      "expansion": "古 (ko-, “old”) + 楽器 (gakki, “musical instrument”)",
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  "etymology_text": "古 (ko-, “old”) + 楽器 (gakki, “musical instrument”).",
  "forms": [
    {
      "form": "古楽器",
      "ruby": [
        [
          "古",
          "こ"
        ],
        [
          "楽",
          "がっ"
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        [
          "器",
          "き"
        ]
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  "lang_code": "ja",
  "pos": "noun",
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  "sounds": [
    {
      "ipa": "[ko̞ɡa̠k̚ʲkʲi]"
    }
  ],
  "word": "古楽器"
}

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      "ruby": [
        [
          "古",
          "こ"
        ],
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          "楽",
          "がっ"
        ],
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          "器",
          "き"
        ]
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  "subsection": "noun",
  "title": "古楽器",
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