"slefren fôr" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "slefr",
        "3": "-en",
        "t1": "slaver, spit"
      },
      "expansion": "slefr (“slaver, spit”) + -en",
      "name": "af"
    }
  ],
  "etymology_text": "slefr (“slaver, spit”) + -en",
  "forms": [
    {
      "form": "slefrod môr",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "slefrod môr"
      },
      "expansion": "slefren fôr f (plural slefrod môr, not mutable)",
      "name": "cy-noun"
    }
  ],
  "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"
        },
        {
          "kind": "other",
          "name": "Welsh terms suffixed with -en",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "cy",
          "name": "Cnidarians",
          "orig": "cy:Cnidarians",
          "parents": [
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "jellyfish"
      ],
      "id": "en-slefren_fôr-cy-noun-oOpTKPAy",
      "links": [
        [
          "jellyfish",
          "jellyfish"
        ]
      ],
      "synonyms": [
        {
          "word": "cont y môr"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "word": "slefren fôr"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "slefr",
        "3": "-en",
        "t1": "slaver, spit"
      },
      "expansion": "slefr (“slaver, spit”) + -en",
      "name": "af"
    }
  ],
  "etymology_text": "slefr (“slaver, spit”) + -en",
  "forms": [
    {
      "form": "slefrod môr",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f",
        "2": "slefrod môr"
      },
      "expansion": "slefren fôr f (plural slefrod môr, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Welsh countable nouns",
        "Welsh entries with incorrect language header",
        "Welsh feminine nouns",
        "Welsh lemmas",
        "Welsh multiword terms",
        "Welsh non-mutable terms",
        "Welsh nouns",
        "Welsh nouns with red links in their headword lines",
        "Welsh terms suffixed with -en",
        "cy:Cnidarians"
      ],
      "glosses": [
        "jellyfish"
      ],
      "links": [
        [
          "jellyfish",
          "jellyfish"
        ]
      ],
      "synonyms": [
        {
          "word": "cont y môr"
        }
      ],
      "tags": [
        "feminine",
        "not-mutable"
      ]
    }
  ],
  "word": "slefren fôr"
}