"drenc" meaning in Ancien français

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en ancien français issus d’un mot en vieux norrois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en ancien français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Ancien français",
      "orig": "ancien français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du vieux norrois throngua.^([1])"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en ancien français de la marine",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Drosse de la vergue."
      ],
      "id": "fr-drenc-fro-noun-pAxcqW4V",
      "topics": [
        "nautical"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "drenc"
}

{
  "categories": [
    "Mots en ancien français issus d’un mot en vieux norrois",
    "Noms communs en ancien français",
    "ancien français"
  ],
  "etymology_texts": [
    "Du vieux norrois throngua.^([1])"
  ],
  "lang": "Ancien français",
  "lang_code": "fro",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en ancien français de la marine"
      ],
      "glosses": [
        "Drosse de la vergue."
      ],
      "topics": [
        "nautical"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "drenc"
}