"dreut" meaning in Breton

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes d’adjectifs en breton",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Breton",
      "orig": "breton",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "treut",
      "tags": [
        "unmutated"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "adj",
  "pos_title": "Forme d’adjectif",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en breton",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              5,
              10
            ]
          ],
          "ref": "Jules Gros, Le Trésor du Breton parlé - 2 : Dictionnaire breton-français des expressions figurées, 1ʳᵉ édition 1970, page 541",
          "text": "Avel dreud a ra.",
          "translation": "Il fait un vent froid et sec (maigre)."
        }
      ],
      "form_of": [
        {
          "word": "treut"
        }
      ],
      "glosses": [
        "Forme mutée de treut par adoucissement (t > d)."
      ],
      "id": "fr-dreut-br-adj-2EJxgdFg"
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈdrøːt\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "dreut"
}

{
  "categories": [
    "Formes d’adjectifs en breton",
    "breton"
  ],
  "forms": [
    {
      "form": "treut",
      "tags": [
        "unmutated"
      ]
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "adj",
  "pos_title": "Forme d’adjectif",
  "senses": [
    {
      "categories": [
        "Exemples en breton"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              5,
              10
            ]
          ],
          "ref": "Jules Gros, Le Trésor du Breton parlé - 2 : Dictionnaire breton-français des expressions figurées, 1ʳᵉ édition 1970, page 541",
          "text": "Avel dreud a ra.",
          "translation": "Il fait un vent froid et sec (maigre)."
        }
      ],
      "form_of": [
        {
          "word": "treut"
        }
      ],
      "glosses": [
        "Forme mutée de treut par adoucissement (t > d)."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\ˈdrøːt\\"
    }
  ],
  "tags": [
    "form-of"
  ],
  "word": "dreut"
}