"dous-" meaning in Gaulois

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots attestés en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Gaulois",
      "orig": "gaulois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Étymologies en gaulois incluant une reconstruction",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Mot attesté dans les noms propres Dousarnus, Dousonna, Dosso, etc.^([1])^([2]).",
    "De l’indo-européen *dous(n)- (avant-bras)^([1])^([2]).",
    "Rapproché du vieil irlandais dóe, génitif doat (avant-bras) et dúais (main)^([1])^([2])."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en gaulois de l’anatomie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Avant-bras."
      ],
      "id": "fr-dous--gaulois-noun-BTwfGm6j",
      "topics": [
        "anatomy"
      ]
    },
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en gaulois de l’anatomie",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Main (incertain)."
      ],
      "id": "fr-dous--gaulois-noun-T2C1anE5",
      "topics": [
        "anatomy"
      ]
    }
  ],
  "word": "dous-"
}

{
  "categories": [
    "Mots attestés en gaulois",
    "Noms communs en gaulois",
    "gaulois",
    "Étymologies en gaulois incluant une reconstruction"
  ],
  "etymology_texts": [
    "Mot attesté dans les noms propres Dousarnus, Dousonna, Dosso, etc.^([1])^([2]).",
    "De l’indo-européen *dous(n)- (avant-bras)^([1])^([2]).",
    "Rapproché du vieil irlandais dóe, génitif doat (avant-bras) et dúais (main)^([1])^([2])."
  ],
  "lang": "Gaulois",
  "lang_code": "gaulois",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Lexique en gaulois de l’anatomie"
      ],
      "glosses": [
        "Avant-bras."
      ],
      "topics": [
        "anatomy"
      ]
    },
    {
      "categories": [
        "Lexique en gaulois de l’anatomie"
      ],
      "glosses": [
        "Main (incertain)."
      ],
      "topics": [
        "anatomy"
      ]
    }
  ],
  "word": "dous-"
}