"bylgja" 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"
    }
  ],
  "etymology_texts": [
    "Du proto-germanique *bulgijō (« vague, houle »), lui-même issu de l'indo-européen commun bʰelǵʰ- (« gonfler »)."
  ],
  "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": [
        "Vague, houle."
      ],
      "id": "fr-bylgja-non-noun-Vt2XXnyW",
      "topics": [
        "nautical"
      ]
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "bylgja"
}

{
  "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"
  ],
  "etymology_texts": [
    "Du proto-germanique *bulgijō (« vague, houle »), lui-même issu de l'indo-européen commun bʰelǵʰ- (« gonfler »)."
  ],
  "lang": "Vieux norrois",
  "lang_code": "non",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en vieux norrois de la marine"
      ],
      "glosses": [
        "Vague, houle."
      ],
      "topics": [
        "nautical"
      ]
    }
  ],
  "tags": [
    "feminine"
  ],
  "word": "bylgja"
}