"二面角" meaning in 日語

{
  "categories": [
    {
      "kind": "other",
      "name": "待分類的日語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "待分類的漢語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "漢語",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "日語",
  "lang_code": "ja",
  "pos": "unknown",
  "senses": [
    {
      "glosses": [
        "〈二面角〉【にめんかく】\n#〈数〉二面角。"
      ],
      "id": "zh-二面角-ja-unknown-b8zE-k8M"
    }
  ],
  "word": "二面角"
}

{
  "categories": [
    "待分類的日語詞",
    "待分類的漢語詞",
    "日語",
    "漢語"
  ],
  "lang": "日語",
  "lang_code": "ja",
  "pos": "unknown",
  "senses": [
    {
      "glosses": [
        "〈二面角〉【にめんかく】\n#〈数〉二面角。"
      ]
    }
  ],
  "word": "二面角"
}