"биеийн" meaning in Mongolian

{
  "forms": [
    {
      "form": "bijeiin",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "биеийн • (bijeiin)",
      "name": "mn-noun-form"
    }
  ],
  "hyphenation": [
    "би‧еийн"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Mongolian entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mongolian terms with redundant script codes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "bije, “a body; oneself”",
          "word": "бие"
        }
      ],
      "glosses": [
        "genitive singular of бие (bije, “a body; oneself”)"
      ],
      "id": "en-биеийн-mn-noun-f9gf9dFk",
      "links": [
        [
          "бие",
          "бие#Mongolian"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "singular"
      ],
      "wikipedia": [
        "Mongolian script"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[pi.jiːŋ˖]"
    }
  ],
  "word": "биеийн"
}

{
  "forms": [
    {
      "form": "bijeiin",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "биеийн • (bijeiin)",
      "name": "mn-noun-form"
    }
  ],
  "hyphenation": [
    "би‧еийн"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Mongolian 2-syllable words",
        "Mongolian entries with incorrect language header",
        "Mongolian non-lemma forms",
        "Mongolian noun forms",
        "Mongolian terms with redundant script codes",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "extra": "bije, “a body; oneself”",
          "word": "бие"
        }
      ],
      "glosses": [
        "genitive singular of бие (bije, “a body; oneself”)"
      ],
      "links": [
        [
          "бие",
          "бие#Mongolian"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "singular"
      ],
      "wikipedia": [
        "Mongolian script"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[pi.jiːŋ˖]"
    }
  ],
  "word": "биеийн"
}