"arth" meaning in Cornique

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en cornique issus d’un mot en indo-européen commun",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en cornique issus d’un mot en proto-celtique",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Mots en cornique issus d’un mot en vieux brittonique",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en cornique",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Cornique",
      "orig": "cornique",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Étymologies en cornique incluant une reconstruction",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du vieux brittonique *arθ, issu du proto-celtique *artos, de l’indo-européen commun *h₂ŕ̥tḱos.",
    "À comparer avec les mots arzh en breton, arth en gallois, artos en gaulois, ursus en latin (sens identique)."
  ],
  "lang": "Cornique",
  "lang_code": "kw",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Animaux en cornique",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Ours."
      ],
      "id": "fr-arth-kw-noun-z6TE5KOV",
      "topics": [
        "zoology"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ors"
    }
  ],
  "tags": [
    "masculine",
    "plural"
  ],
  "word": "arth"
}

{
  "categories": [
    "Mots en cornique issus d’un mot en indo-européen commun",
    "Mots en cornique issus d’un mot en proto-celtique",
    "Mots en cornique issus d’un mot en vieux brittonique",
    "Noms communs en cornique",
    "cornique",
    "Étymologies en cornique incluant une reconstruction"
  ],
  "etymology_texts": [
    "Du vieux brittonique *arθ, issu du proto-celtique *artos, de l’indo-européen commun *h₂ŕ̥tḱos.",
    "À comparer avec les mots arzh en breton, arth en gallois, artos en gaulois, ursus en latin (sens identique)."
  ],
  "lang": "Cornique",
  "lang_code": "kw",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Animaux en cornique"
      ],
      "glosses": [
        "Ours."
      ],
      "topics": [
        "zoology"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ors"
    }
  ],
  "tags": [
    "masculine",
    "plural"
  ],
  "word": "arth"
}