"暗算" meaning in 朝鮮語

{
  "categories": [
    {
      "kind": "other",
      "name": "朝鮮語",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "朝鮮語_名詞",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "암산"
    }
  ],
  "lang": "朝鮮語",
  "lang_code": "ko",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "glosses": [
        "道具を用いずに頭の中だけで計算すること。"
      ],
      "id": "ja-暗算-ko-noun-WT0LDfCQ"
    }
  ],
  "word": "暗算"
}

{
  "categories": [
    "朝鮮語",
    "朝鮮語_名詞"
  ],
  "forms": [
    {
      "form": "암산"
    }
  ],
  "lang": "朝鮮語",
  "lang_code": "ko",
  "pos": "noun",
  "pos_title": "名詞",
  "senses": [
    {
      "glosses": [
        "道具を用いずに頭の中だけで計算すること。"
      ]
    }
  ],
  "word": "暗算"
}