"trein" meaning in Breton

{
  "head_templates": [
    {
      "args": {
        "1": "br",
        "2": "mutated noun"
      },
      "expansion": "trein",
      "name": "head"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Breton entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 4 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Hard mutation of drein."
      ],
      "id": "en-trein-br-noun-uS8yMQB5",
      "links": [
        [
          "drein",
          "drein#Breton"
        ]
      ]
    }
  ],
  "word": "trein"
}

{
  "head_templates": [
    {
      "args": {
        "1": "br",
        "2": "mutated noun"
      },
      "expansion": "trein",
      "name": "head"
    }
  ],
  "lang": "Breton",
  "lang_code": "br",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Breton entries with incorrect language header",
        "Breton hard-mutation forms",
        "Breton mutated nouns",
        "Breton non-lemma forms",
        "Pages with 4 entries",
        "Pages with entries"
      ],
      "glosses": [
        "Hard mutation of drein."
      ],
      "links": [
        [
          "drein",
          "drein#Breton"
        ]
      ]
    }
  ],
  "word": "trein"
}