"volkanegezh" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Genres manquants en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms de sciences en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en breton de la géologie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Volcanologie."
      ],
      "id": "fr-volkanegezh-br-noun-Yzb1jMjh",
      "topics": [
        "geology"
      ]
    }
  ],
  "word": "volkanegezh"
}

{
  "categories": [
    "Genres manquants en breton",
    "Noms communs en breton",
    "Noms de sciences en breton",
    "breton"
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "pos_title": "Nom commun",
  "raw_tags": [
    "genre à préciser : {{m}}, {{f}}, {{mf}}, {{n}} ?"
  ],
  "senses": [
    {
      "categories": [
        "Lexique en breton de la géologie"
      ],
      "glosses": [
        "Volcanologie."
      ],
      "topics": [
        "geology"
      ]
    }
  ],
  "word": "volkanegezh"
}