"үүлэн" meaning in Mongolian

{
  "forms": [
    {
      "form": "üülen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "үүлэн • (üülen)",
      "name": "mn-noun-form"
    }
  ],
  "hyphenation": [
    "үү‧лэн"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Mongolian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mongolian terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "üül",
          "word": "үүл"
        }
      ],
      "glosses": [
        "attributive form of үүл (üül)"
      ],
      "id": "en-үүлэн-mn-noun-xoKV8Ixe",
      "links": [
        [
          "үүл",
          "үүл#Mongolian"
        ]
      ],
      "tags": [
        "attributive",
        "form-of"
      ],
      "wikipedia": [
        "Mongolian script"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈuːɮeŋ/"
    }
  ],
  "word": "үүлэн"
}

{
  "forms": [
    {
      "form": "üülen",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "үүлэн • (üülen)",
      "name": "mn-noun-form"
    }
  ],
  "hyphenation": [
    "үү‧лэн"
  ],
  "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 IPA pronunciation",
        "Mongolian terms with redundant script codes"
      ],
      "form_of": [
        {
          "extra": "üül",
          "word": "үүл"
        }
      ],
      "glosses": [
        "attributive form of үүл (üül)"
      ],
      "links": [
        [
          "үүл",
          "үүл#Mongolian"
        ]
      ],
      "tags": [
        "attributive",
        "form-of"
      ],
      "wikipedia": [
        "Mongolian script"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈuːɮeŋ/"
    }
  ],
  "word": "үүлэн"
}