"sylfaen" meaning in Welsh

{
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "syl-",
        "3": "maen",
        "t2": "stone"
      },
      "expansion": "syl- + maen (“stone”)",
      "name": "compound"
    },
    {
      "args": {
        "1": "la",
        "2": "solum",
        "t": "ground, base"
      },
      "expansion": "Latin solum (“ground, base”)",
      "name": "m+"
    },
    {
      "args": {
        "1": "cy",
        "2": "sail",
        "3": "",
        "4": "basis"
      },
      "expansion": "sail (“basis”)",
      "name": "m"
    },
    {
      "args": {
        "1": "cy",
        "2": "sylwedd",
        "3": "",
        "4": "substance, essence"
      },
      "expansion": "sylwedd (“substance, essence”)",
      "name": "m"
    }
  ],
  "etymology_text": "From syl- + maen (“stone”). The first element is related to (either derived from or cognate with) Latin solum (“ground, base”); compare sail (“basis”) and sylwedd (“substance, essence”).",
  "forms": [
    {
      "form": "sylfeini",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mf",
        "2": "sylfeini"
      },
      "expansion": "sylfaen m or f (plural sylfeini, not mutable)",
      "name": "cy-noun"
    }
  ],
  "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"
        }
      ],
      "derived": [
        {
          "english": "foundation stone",
          "word": "carreg sylfaen"
        },
        {
          "english": "foundation subject",
          "word": "pwnc sylfaen"
        },
        {
          "english": "foundational, basic",
          "word": "sylfaenol"
        },
        {
          "word": "→ English: Sylfaen"
        }
      ],
      "glosses": [
        "foundation, base, basis"
      ],
      "id": "en-sylfaen-cy-noun-xIWXTROL",
      "links": [
        [
          "foundation",
          "foundation"
        ],
        [
          "base",
          "base"
        ],
        [
          "basis",
          "basis"
        ]
      ],
      "synonyms": [
        {
          "word": "bas"
        },
        {
          "word": "gwreiddyn"
        },
        {
          "word": "sail"
        },
        {
          "word": "sawd"
        }
      ],
      "tags": [
        "feminine",
        "masculine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsəlvaɨ̯n/",
      "tags": [
        "North-Wales"
      ]
    },
    {
      "ipa": "/ˈsəlvai̯n/",
      "tags": [
        "South-Wales"
      ]
    }
  ],
  "word": "sylfaen"
}

{
  "derived": [
    {
      "english": "foundation stone",
      "word": "carreg sylfaen"
    },
    {
      "english": "foundation subject",
      "word": "pwnc sylfaen"
    },
    {
      "english": "foundational, basic",
      "word": "sylfaenol"
    },
    {
      "word": "→ English: Sylfaen"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "cy",
        "2": "syl-",
        "3": "maen",
        "t2": "stone"
      },
      "expansion": "syl- + maen (“stone”)",
      "name": "compound"
    },
    {
      "args": {
        "1": "la",
        "2": "solum",
        "t": "ground, base"
      },
      "expansion": "Latin solum (“ground, base”)",
      "name": "m+"
    },
    {
      "args": {
        "1": "cy",
        "2": "sail",
        "3": "",
        "4": "basis"
      },
      "expansion": "sail (“basis”)",
      "name": "m"
    },
    {
      "args": {
        "1": "cy",
        "2": "sylwedd",
        "3": "",
        "4": "substance, essence"
      },
      "expansion": "sylwedd (“substance, essence”)",
      "name": "m"
    }
  ],
  "etymology_text": "From syl- + maen (“stone”). The first element is related to (either derived from or cognate with) Latin solum (“ground, base”); compare sail (“basis”) and sylwedd (“substance, essence”).",
  "forms": [
    {
      "form": "sylfeini",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "mf",
        "2": "sylfeini"
      },
      "expansion": "sylfaen m or f (plural sylfeini, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Welsh compound terms",
        "Welsh countable nouns",
        "Welsh entries with incorrect language header",
        "Welsh feminine nouns",
        "Welsh lemmas",
        "Welsh masculine nouns",
        "Welsh non-mutable terms",
        "Welsh nouns",
        "Welsh nouns with multiple genders",
        "Welsh nouns with red links in their headword lines",
        "Welsh terms with IPA pronunciation"
      ],
      "glosses": [
        "foundation, base, basis"
      ],
      "links": [
        [
          "foundation",
          "foundation"
        ],
        [
          "base",
          "base"
        ],
        [
          "basis",
          "basis"
        ]
      ],
      "synonyms": [
        {
          "word": "bas"
        },
        {
          "word": "gwreiddyn"
        },
        {
          "word": "sail"
        },
        {
          "word": "sawd"
        }
      ],
      "tags": [
        "feminine",
        "masculine",
        "not-mutable"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsəlvaɨ̯n/",
      "tags": [
        "North-Wales"
      ]
    },
    {
      "ipa": "/ˈsəlvai̯n/",
      "tags": [
        "South-Wales"
      ]
    }
  ],
  "word": "sylfaen"
}