"byrr" meaning in Vieux norrois

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en vieux norrois issus d’un mot en indo-européen commun",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en vieux norrois issus d’un mot en proto-germanique",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en vieux norrois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Vieux norrois",
      "orig": "vieux norrois",
      "parents": [],
      "source": "w"
    }
  ],
  "derived": [
    {
      "lang": "Islandais",
      "lang_code": "is",
      "word": "byr"
    }
  ],
  "etymology_texts": [
    "Du proto-germanique *buriz (« vent favorable »), lui-même issu de l'indo-européen commun *bʰer- (« porter »)."
  ],
  "lang": "Vieux norrois",
  "lang_code": "non",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en vieux norrois de la marine",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Vent favorable."
      ],
      "id": "fr-byrr-non-noun-DTyrwQ-y",
      "topics": [
        "nautical"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "byrr"
}

{
  "categories": [
    "Mots en vieux norrois issus d’un mot en indo-européen commun",
    "Mots en vieux norrois issus d’un mot en proto-germanique",
    "Noms communs en vieux norrois",
    "vieux norrois"
  ],
  "derived": [
    {
      "lang": "Islandais",
      "lang_code": "is",
      "word": "byr"
    }
  ],
  "etymology_texts": [
    "Du proto-germanique *buriz (« vent favorable »), lui-même issu de l'indo-européen commun *bʰer- (« porter »)."
  ],
  "lang": "Vieux norrois",
  "lang_code": "non",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en vieux norrois de la marine"
      ],
      "glosses": [
        "Vent favorable."
      ],
      "topics": [
        "nautical"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "byrr"
}