"derw" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "cel-bry-pro",
        "3": "*dar"
      },
      "expansion": "Proto-Brythonic *dar",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "cel-pro",
        "3": "*daru"
      },
      "expansion": "Proto-Celtic *daru",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "ine-pro",
        "3": "*dóru"
      },
      "expansion": "Proto-Indo-European *dóru",
      "name": "inh"
    },
    {
      "args": {
        "1": "grc",
        "2": "δόρυ",
        "3": "",
        "4": "tree"
      },
      "expansion": "Ancient Greek δόρυ (dóru, “tree”)",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Brythonic *dar, from Proto-Celtic *daru, from Proto-Indo-European *dóru; compare Ancient Greek δόρυ (dóru, “tree”).",
  "forms": [
    {
      "form": "derwen",
      "tags": [
        "singulative"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cy-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "derw",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "dderw",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-soft"
      ]
    },
    {
      "form": "nerw",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-nasal"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f-p",
        "2": "derwen"
      },
      "expansion": "derw f (collective, singulative derwen)",
      "name": "cy-noun"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "cy-mut"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh links with redundant wikilinks",
          "parents": [
            "Links with redundant wikilinks",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "cy",
          "name": "Trees",
          "orig": "cy:Trees",
          "parents": [
            "Plants",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "alt": "y",
          "english": "oak apple",
          "word": "afal derw"
        },
        {
          "english": "oak hook-tip moth",
          "word": "bachadain y derw"
        },
        {
          "english": "tree liverwort",
          "word": "barfau'r derw"
        },
        {
          "alt": "y",
          "english": "oak sap",
          "word": "bloneg derw"
        },
        {
          "word": "callod y derw"
        },
        {
          "english": "lungwort",
          "word": "clustiau'r derw"
        },
        {
          "english": "green woodpecker",
          "word": "delor y derw"
        },
        {
          "word": "llawredyn y derw"
        },
        {
          "word": "marchredyn y derw"
        },
        {
          "english": "common polypody",
          "word": "rhedyn y derw"
        },
        {
          "english": "titmouse",
          "word": "llygoden y derw"
        },
        {
          "english": "tree fungus",
          "word": "madarch y derw"
        }
      ],
      "glosses": [
        "oaks"
      ],
      "id": "en-derw-cy-noun-wupydo7c",
      "links": [
        [
          "oak",
          "oak"
        ]
      ],
      "related": [
        {
          "english": "druid",
          "word": "derwydd"
        }
      ],
      "synonyms": [
        {
          "word": "deri"
        }
      ],
      "tags": [
        "collective",
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈdɛru/",
      "tags": [
        "North-Wales"
      ]
    },
    {
      "ipa": "/ˈdeːru/",
      "tags": [
        "South-Wales"
      ]
    },
    {
      "ipa": "/ˈdɛru/",
      "tags": [
        "South-Wales"
      ]
    }
  ],
  "word": "derw"
}

{
  "derived": [
    {
      "alt": "y",
      "english": "oak apple",
      "word": "afal derw"
    },
    {
      "english": "oak hook-tip moth",
      "word": "bachadain y derw"
    },
    {
      "english": "tree liverwort",
      "word": "barfau'r derw"
    },
    {
      "alt": "y",
      "english": "oak sap",
      "word": "bloneg derw"
    },
    {
      "word": "callod y derw"
    },
    {
      "english": "lungwort",
      "word": "clustiau'r derw"
    },
    {
      "english": "green woodpecker",
      "word": "delor y derw"
    },
    {
      "word": "llawredyn y derw"
    },
    {
      "word": "marchredyn y derw"
    },
    {
      "english": "common polypody",
      "word": "rhedyn y derw"
    },
    {
      "english": "titmouse",
      "word": "llygoden y derw"
    },
    {
      "english": "tree fungus",
      "word": "madarch y derw"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "cel-bry-pro",
        "3": "*dar"
      },
      "expansion": "Proto-Brythonic *dar",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "cel-pro",
        "3": "*daru"
      },
      "expansion": "Proto-Celtic *daru",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "ine-pro",
        "3": "*dóru"
      },
      "expansion": "Proto-Indo-European *dóru",
      "name": "inh"
    },
    {
      "args": {
        "1": "grc",
        "2": "δόρυ",
        "3": "",
        "4": "tree"
      },
      "expansion": "Ancient Greek δόρυ (dóru, “tree”)",
      "name": "cog"
    }
  ],
  "etymology_text": "From Proto-Brythonic *dar, from Proto-Celtic *daru, from Proto-Indo-European *dóru; compare Ancient Greek δόρυ (dóru, “tree”).",
  "forms": [
    {
      "form": "derwen",
      "tags": [
        "singulative"
      ]
    },
    {
      "form": "no-table-tags",
      "source": "mutation",
      "tags": [
        "table-tags"
      ]
    },
    {
      "form": "cy-mut",
      "source": "mutation",
      "tags": [
        "inflection-template"
      ]
    },
    {
      "form": "derw",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-radical"
      ]
    },
    {
      "form": "dderw",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-soft"
      ]
    },
    {
      "form": "nerw",
      "source": "mutation",
      "tags": [
        "mutation",
        "mutation-nasal"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f-p",
        "2": "derwen"
      },
      "expansion": "derw f (collective, singulative derwen)",
      "name": "cy-noun"
    }
  ],
  "inflection_templates": [
    {
      "args": {},
      "name": "cy-mut"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "related": [
    {
      "english": "druid",
      "word": "derwydd"
    }
  ],
  "senses": [
    {
      "categories": [
        "Welsh collective nouns",
        "Welsh entries with incorrect language header",
        "Welsh entries with topic categories using raw markup",
        "Welsh feminine nouns",
        "Welsh lemmas",
        "Welsh links with redundant wikilinks",
        "Welsh nouns",
        "Welsh terms derived from Proto-Brythonic",
        "Welsh terms derived from Proto-Celtic",
        "Welsh terms derived from Proto-Indo-European",
        "Welsh terms inherited from Proto-Brythonic",
        "Welsh terms inherited from Proto-Celtic",
        "Welsh terms inherited from Proto-Indo-European",
        "Welsh terms with IPA pronunciation",
        "cy:Trees"
      ],
      "glosses": [
        "oaks"
      ],
      "links": [
        [
          "oak",
          "oak"
        ]
      ],
      "synonyms": [
        {
          "word": "deri"
        }
      ],
      "tags": [
        "collective",
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈdɛru/",
      "tags": [
        "North-Wales"
      ]
    },
    {
      "ipa": "/ˈdeːru/",
      "tags": [
        "South-Wales"
      ]
    },
    {
      "ipa": "/ˈdɛru/",
      "tags": [
        "South-Wales"
      ]
    }
  ],
  "word": "derw"
}