"sinum" meaning in Icelandic

{
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "noun form"
      },
      "expansion": "sinum",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "_dis": "32 6 21 24 17",
          "kind": "other",
          "name": "Old English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "form_of": [
        {
          "word": "sin"
        }
      ],
      "glosses": [
        "indefinite dative plural of sin"
      ],
      "id": "en-sinum-is-noun-bKw7WPB0",
      "links": [
        [
          "sin",
          "sin#Icelandic"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "indefinite",
        "plural"
      ]
    }
  ],
  "word": "sinum"
}

{
  "categories": [
    "Old English entries with incorrect language header",
    "Old English non-lemma forms",
    "Old English pronoun forms",
    "Old English terms with IPA pronunciation"
  ],
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "noun form"
      },
      "expansion": "sinum",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Icelandic entries with incorrect language header",
        "Icelandic non-lemma forms",
        "Icelandic noun forms"
      ],
      "form_of": [
        {
          "word": "sin"
        }
      ],
      "glosses": [
        "indefinite dative plural of sin"
      ],
      "links": [
        [
          "sin",
          "sin#Icelandic"
        ]
      ],
      "tags": [
        "dative",
        "form-of",
        "indefinite",
        "plural"
      ]
    }
  ],
  "word": "sinum"
}