"覆面算" meaning in Japanese

{
  "etymology_templates": [
    {
      "args": {
        "1": "覆面",
        "2": "ふくめん",
        "3": "算",
        "4": "さん",
        "t1": "",
        "t2": ""
      },
      "expansion": "覆面(ふくめん) (fukumen) + 算(さん) (san)",
      "name": "ja-compound"
    },
    {
      "args": {
        "1": "ja",
        "2": "覆面算"
      },
      "expansion": "ふくめんさん'",
      "name": "sortkey"
    },
    {
      "args": {
        "1": "san",
        "2": "zan"
      },
      "expansion": "The san changes to zan as an instance of rendaku (連濁).",
      "name": "rendaku2"
    }
  ],
  "etymology_text": "From 覆面(ふくめん) (fukumen) + 算(さん) (san). The san changes to zan as an instance of rendaku (連濁).",
  "forms": [
    {
      "form": "覆面算",
      "ruby": [
        [
          "覆",
          "ふく"
        ],
        [
          "面",
          "めん"
        ],
        [
          "算",
          "ざん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "fukumenzan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "ふくめんざん",
      "roman": "fukumenzan",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ふくめんざん",
        "hhira": "ふくめんざん"
      },
      "expansion": "覆(ふく)面(めん)算(ざん) • (fukumenzan) ^(←ふくめんざん (fukumenzan)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Japanese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
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          "kind": "other",
          "name": "Japanese links with redundant alt parameters",
          "parents": [
            "Links with redundant alt parameters",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with 3 kanji",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with redundant sortkeys",
          "parents": [
            "Terms with redundant sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Japanese terms with rendaku",
          "parents": [],
          "source": "w"
        },
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          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
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          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ja",
          "name": "Mathematics",
          "orig": "ja:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "verbal arithmetic"
      ],
      "id": "en-覆面算-ja-noun-OXE8xrDm",
      "links": [
        [
          "verbal arithmetic",
          "verbal arithmetic"
        ]
      ],
      "wikipedia": [
        "ja:覆面算"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɸɯ̟kɯ̟mẽ̞nd͡zã̠ɴ]"
    }
  ],
  "word": "覆面算"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "覆面",
        "2": "ふくめん",
        "3": "算",
        "4": "さん",
        "t1": "",
        "t2": ""
      },
      "expansion": "覆面(ふくめん) (fukumen) + 算(さん) (san)",
      "name": "ja-compound"
    },
    {
      "args": {
        "1": "ja",
        "2": "覆面算"
      },
      "expansion": "ふくめんさん'",
      "name": "sortkey"
    },
    {
      "args": {
        "1": "san",
        "2": "zan"
      },
      "expansion": "The san changes to zan as an instance of rendaku (連濁).",
      "name": "rendaku2"
    }
  ],
  "etymology_text": "From 覆面(ふくめん) (fukumen) + 算(さん) (san). The san changes to zan as an instance of rendaku (連濁).",
  "forms": [
    {
      "form": "覆面算",
      "ruby": [
        [
          "覆",
          "ふく"
        ],
        [
          "面",
          "めん"
        ],
        [
          "算",
          "ざん"
        ]
      ],
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "fukumenzan",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "ふくめんざん",
      "roman": "fukumenzan",
      "tags": [
        "hiragana",
        "historical"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ふくめんざん",
        "hhira": "ふくめんざん"
      },
      "expansion": "覆(ふく)面(めん)算(ざん) • (fukumenzan) ^(←ふくめんざん (fukumenzan)?)",
      "name": "ja-noun"
    }
  ],
  "lang": "Japanese",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Japanese compound terms",
        "Japanese entries with incorrect language header",
        "Japanese lemmas",
        "Japanese links with redundant alt parameters",
        "Japanese links with redundant wikilinks",
        "Japanese nouns",
        "Japanese terms spelled with second grade kanji",
        "Japanese terms spelled with secondary school kanji",
        "Japanese terms spelled with third grade kanji",
        "Japanese terms with 3 kanji",
        "Japanese terms with IPA pronunciation",
        "Japanese terms with IPA pronunciation missing pitch accent",
        "Japanese terms with redundant sortkeys",
        "Japanese terms with rendaku",
        "Pages with 1 entry",
        "Pages with entries",
        "ja:Mathematics"
      ],
      "glosses": [
        "verbal arithmetic"
      ],
      "links": [
        [
          "verbal arithmetic",
          "verbal arithmetic"
        ]
      ],
      "wikipedia": [
        "ja:覆面算"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɸɯ̟kɯ̟mẽ̞nd͡zã̠ɴ]"
    }
  ],
  "word": "覆面算"
}

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  "msg": "HTML tag <span> not properly closed",
  "path": [
    "覆面算"
  ],
  "section": "Japanese",
  "subsection": "noun",
  "title": "覆面算",
  "trace": "started on line 2, detected on line 2"
}

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  "msg": "no corresponding start tag found for </span>",
  "path": [
    "覆面算"
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  "section": "Japanese",
  "subsection": "noun",
  "title": "覆面算",
  "trace": ""
}