"fferau" meaning in Welsh

{
  "head_templates": [
    {
      "args": {},
      "expansion": "fferau (not mutable)",
      "name": "cy-noun form"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Welsh entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "ffêr"
        }
      ],
      "glosses": [
        "plural of ffêr"
      ],
      "id": "en-fferau-cy-noun-fy6N-Ff8",
      "links": [
        [
          "ffêr",
          "ffêr#Welsh"
        ]
      ],
      "tags": [
        "form-of",
        "not-mutable",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɛraɨ̯"
    }
  ],
  "word": "fferau"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "fferau (not mutable)",
      "name": "cy-noun form"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Rhymes:Welsh/ɛraɨ̯",
        "Rhymes:Welsh/ɛraɨ̯/2 syllables",
        "Welsh entries with incorrect language header",
        "Welsh non-lemma forms",
        "Welsh non-mutable terms",
        "Welsh noun forms"
      ],
      "form_of": [
        {
          "word": "ffêr"
        }
      ],
      "glosses": [
        "plural of ffêr"
      ],
      "links": [
        [
          "ffêr",
          "ffêr#Welsh"
        ]
      ],
      "tags": [
        "form-of",
        "not-mutable",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "rhymes": "-ɛraɨ̯"
    }
  ],
  "word": "fferau"
}