"-leis" meaning in Norwegian Bokmål

{
  "etymology_templates": [
    {
      "args": {
        "1": "nb",
        "2": "non",
        "3": "-leiðis"
      },
      "expansion": "Old Norse -leiðis",
      "name": "der"
    },
    {
      "args": {
        "1": "non",
        "2": "leiði"
      },
      "expansion": "leiði",
      "name": "m"
    }
  ],
  "etymology_text": "From Old Norse -leiðis, genitive of leiði.",
  "head_templates": [
    {
      "args": {
        "1": "nb",
        "2": "suffix"
      },
      "expansion": "-leis",
      "name": "head"
    }
  ],
  "lang": "Norwegian Bokmål",
  "lang_code": "nb",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Norwegian Bokmål entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Norwegian Bokmål entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Norwegian Bokmål terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "suffix used to create words describing in which manner something is."
      ],
      "id": "en--leis-nb-suffix-WEVnCXqp",
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-leis"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "nb",
        "2": "non",
        "3": "-leiðis"
      },
      "expansion": "Old Norse -leiðis",
      "name": "der"
    },
    {
      "args": {
        "1": "non",
        "2": "leiði"
      },
      "expansion": "leiði",
      "name": "m"
    }
  ],
  "etymology_text": "From Old Norse -leiðis, genitive of leiði.",
  "head_templates": [
    {
      "args": {
        "1": "nb",
        "2": "suffix"
      },
      "expansion": "-leis",
      "name": "head"
    }
  ],
  "lang": "Norwegian Bokmål",
  "lang_code": "nb",
  "pos": "suffix",
  "senses": [
    {
      "categories": [
        "Norwegian Bokmål adverb-forming suffixes",
        "Norwegian Bokmål entries with incorrect language header",
        "Norwegian Bokmål entries with language name categories using raw markup",
        "Norwegian Bokmål lemmas",
        "Norwegian Bokmål suffixes",
        "Norwegian Bokmål terms derived from Old Norse",
        "Norwegian Bokmål terms with non-redundant non-automated sortkeys"
      ],
      "glosses": [
        "suffix used to create words describing in which manner something is."
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-leis"
}