"-оод" meaning in Mongolian

{
  "forms": [
    {
      "form": "-ood",
      "tags": [
        "romanization"
      ]
    }
  ],
  "hyphenation": [
    "оод"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "suffix",
  "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"
        }
      ],
      "glosses": [
        "rounded back vowel harmonic form of -аад (-aad)"
      ],
      "id": "en--оод-mn-suffix-O6SvmRoi",
      "links": [
        [
          "-аад",
          "-аад#Mongolian"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈoːt/"
    }
  ],
  "word": "-оод"
}

{
  "forms": [
    {
      "form": "-ood",
      "tags": [
        "romanization"
      ]
    }
  ],
  "hyphenation": [
    "оод"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Mongolian entries with incorrect language header",
        "Mongolian non-lemma forms",
        "Mongolian suffix forms",
        "Mongolian terms with IPA pronunciation",
        "Mongolian terms with redundant script codes"
      ],
      "glosses": [
        "rounded back vowel harmonic form of -аад (-aad)"
      ],
      "links": [
        [
          "-аад",
          "-аад#Mongolian"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈoːt/"
    }
  ],
  "word": "-оод"
}