"허수" meaning in Korean

{
  "etymology_templates": [
    {
      "args": {
        "1": "虛",
        "2": "empty",
        "3": "數",
        "4": "number"
      },
      "expansion": "Sino-Korean word from 虛數, from 虛 (“empty”) + 數 (“number”)",
      "name": "ko-etym-Sino"
    }
  ],
  "etymology_text": "Sino-Korean word from 虛數, from 虛 (“empty”) + 數 (“number”)",
  "forms": [
    {
      "form": "heosu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "虛數",
      "tags": [
        "hanja"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "hanja": "虛數"
      },
      "expansion": "허수 • (heosu) (hanja 虛數)",
      "name": "ko-noun"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Korean entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Korean terms with redundant transliterations",
          "parents": [
            "Terms with redundant transliterations",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Sino-Korean words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "ko",
          "name": "Mathematics",
          "orig": "ko:Mathematics",
          "parents": [
            "Formal sciences",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "imaginary number (number of the form ai)"
      ],
      "id": "en-허수-ko-noun-H6MMoA3~",
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "imaginary number",
          "imaginary number"
        ]
      ],
      "raw_glosses": [
        "(mathematics) imaginary number (number of the form ai)"
      ],
      "synonyms": [
        {
          "roman": "heo",
          "word": "허(虛)"
        }
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[hʌ̹sʰu]",
      "tags": [
        "SK-Standard",
        "Seoul"
      ]
    },
    {
      "hangeul": "허수"
    },
    {
      "other": "[허수]"
    }
  ],
  "word": "허수"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "虛",
        "2": "empty",
        "3": "數",
        "4": "number"
      },
      "expansion": "Sino-Korean word from 虛數, from 虛 (“empty”) + 數 (“number”)",
      "name": "ko-etym-Sino"
    }
  ],
  "etymology_text": "Sino-Korean word from 虛數, from 虛 (“empty”) + 數 (“number”)",
  "forms": [
    {
      "form": "heosu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "虛數",
      "tags": [
        "hanja"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "hanja": "虛數"
      },
      "expansion": "허수 • (heosu) (hanja 虛數)",
      "name": "ko-noun"
    }
  ],
  "lang": "Korean",
  "lang_code": "ko",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Korean entries with incorrect language header",
        "Korean lemmas",
        "Korean nouns",
        "Korean terms with IPA pronunciation",
        "Korean terms with redundant script codes",
        "Korean terms with redundant transliterations",
        "Pages with 1 entry",
        "Pages with entries",
        "Sino-Korean words",
        "ko:Mathematics"
      ],
      "glosses": [
        "imaginary number (number of the form ai)"
      ],
      "links": [
        [
          "mathematics",
          "mathematics"
        ],
        [
          "imaginary number",
          "imaginary number"
        ]
      ],
      "raw_glosses": [
        "(mathematics) imaginary number (number of the form ai)"
      ],
      "topics": [
        "mathematics",
        "sciences"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[hʌ̹sʰu]",
      "tags": [
        "SK-Standard",
        "Seoul"
      ]
    },
    {
      "hangeul": "허수"
    },
    {
      "other": "[허수]"
    }
  ],
  "synonyms": [
    {
      "roman": "heo",
      "word": "허(虛)"
    }
  ],
  "word": "허수"
}