"derwen" meaning in Cornish

{
  "head_templates": [
    {
      "args": {
        "1": "kw",
        "2": "singulative",
        "g": "f"
      },
      "expansion": "derwen f",
      "name": "head"
    }
  ],
  "lang": "Cornish",
  "lang_code": "kw",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Cornish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Cornish entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Cornish singulatives",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "kw",
          "name": "Trees",
          "orig": "kw:Trees",
          "parents": [
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "extra": "oaks",
          "word": "derow"
        }
      ],
      "glosses": [
        "singulative of derow (“oaks”)"
      ],
      "id": "en-derwen-kw-noun-MwCZCvUq",
      "links": [
        [
          "derow",
          "derow#Cornish"
        ]
      ],
      "synonyms": [
        {
          "word": "derowen"
        }
      ],
      "tags": [
        "feminine",
        "form-of",
        "singulative"
      ]
    }
  ],
  "word": "derwen"
}

{
  "head_templates": [
    {
      "args": {
        "1": "kw",
        "2": "singulative",
        "g": "f"
      },
      "expansion": "derwen f",
      "name": "head"
    }
  ],
  "lang": "Cornish",
  "lang_code": "kw",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Cornish entries with incorrect language header",
        "Cornish entries with topic categories using raw markup",
        "Cornish non-lemma forms",
        "Cornish singulatives",
        "kw:Trees"
      ],
      "form_of": [
        {
          "extra": "oaks",
          "word": "derow"
        }
      ],
      "glosses": [
        "singulative of derow (“oaks”)"
      ],
      "links": [
        [
          "derow",
          "derow#Cornish"
        ]
      ],
      "tags": [
        "feminine",
        "form-of",
        "singulative"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "derowen"
    }
  ],
  "word": "derwen"
}