"and-" meaning in Icelandic

{
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "non",
        "3": "and-"
      },
      "expansion": "Old Norse and-",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Norse and-.",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "prefix"
      },
      "expansion": "and-",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Icelandic entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "anti-, against, opposing"
      ],
      "id": "en-and--is-prefix-gLiV2YMn",
      "links": [
        [
          "anti-",
          "anti-"
        ],
        [
          "against",
          "against"
        ],
        [
          "opposing",
          "opposing"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "and-"
}

{
  "categories": [
    "Old Saxon entries with incorrect language header",
    "Old Saxon lemmas",
    "Old Saxon prefixes",
    "Old Saxon terms derived from Proto-Germanic",
    "Old Saxon terms derived from Proto-West Germanic",
    "Old Saxon terms inherited from Proto-Germanic",
    "Old Saxon terms inherited from Proto-West Germanic",
    "Old Saxon terms with IPA pronunciation"
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "is",
        "2": "non",
        "3": "and-"
      },
      "expansion": "Old Norse and-",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old Norse and-.",
  "head_templates": [
    {
      "args": {
        "1": "is",
        "2": "prefix"
      },
      "expansion": "and-",
      "name": "head"
    }
  ],
  "lang": "Icelandic",
  "lang_code": "is",
  "pos": "prefix",
  "senses": [
    {
      "categories": [
        "Icelandic entries with incorrect language header",
        "Icelandic lemmas",
        "Icelandic prefixes",
        "Icelandic terms derived from Old Norse",
        "Icelandic terms inherited from Old Norse"
      ],
      "glosses": [
        "anti-, against, opposing"
      ],
      "links": [
        [
          "anti-",
          "anti-"
        ],
        [
          "against",
          "against"
        ],
        [
          "opposing",
          "opposing"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "and-"
}