"duûm" meaning in Latin

{
  "etymology_text": "Alternative spelling of duum, an alternative form of duōrum, an inflected form of duo (“two”). For the origin of the alternative second-declension genitive plural endings -um and -ōrum and the use of the circumflexed spelling duûm, see the notes at -um.",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "numeral form"
      },
      "expansion": "duûm",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "num",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Latin entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "duo"
        }
      ],
      "glosses": [
        "genitive masculine/neuter of duo"
      ],
      "id": "en-duûm-la-num-APThFGbs",
      "links": [
        [
          "duo",
          "duo#Latin"
        ]
      ],
      "synonyms": [
        {
          "word": "duum"
        }
      ],
      "tags": [
        "form-of",
        "genitive",
        "masculine",
        "neuter"
      ]
    }
  ],
  "word": "duûm"
}

{
  "etymology_text": "Alternative spelling of duum, an alternative form of duōrum, an inflected form of duo (“two”). For the origin of the alternative second-declension genitive plural endings -um and -ōrum and the use of the circumflexed spelling duûm, see the notes at -um.",
  "head_templates": [
    {
      "args": {
        "1": "la",
        "2": "numeral form"
      },
      "expansion": "duûm",
      "name": "head"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "num",
  "senses": [
    {
      "categories": [
        "Latin entries with incorrect language header",
        "Latin non-lemma forms",
        "Latin numeral forms",
        "Latin terms spelled with Û",
        "Latin terms spelled with ◌̂",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "form_of": [
        {
          "word": "duo"
        }
      ],
      "glosses": [
        "genitive masculine/neuter of duo"
      ],
      "links": [
        [
          "duo",
          "duo#Latin"
        ]
      ],
      "tags": [
        "form-of",
        "genitive",
        "masculine",
        "neuter"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "duum"
    }
  ],
  "word": "duûm"
}