"halwyn" meaning in Welsh

{
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      "expansion": "Inherited",
      "name": "glossary"
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    {
      "args": {
        "1": "cy",
        "2": "wlm",
        "3": "halaen",
        "4": "",
        "5": "",
        "g": "",
        "g2": "",
        "g3": "",
        "id": "",
        "lit": "",
        "nocat": "",
        "pos": "",
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        "sort": "",
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        "ts": ""
      },
      "expansion": "Middle Welsh halaen",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "wlm",
        "3": "halaen"
      },
      "expansion": "Inherited from Middle Welsh halaen",
      "name": "inh+"
    },
    {
      "args": {
        "1": "cy",
        "2": "halen (“table salt”)"
      },
      "expansion": "Doublet of halen (“table salt”)",
      "name": "doublet"
    }
  ],
  "etymology_text": "Inherited from Middle Welsh halaen, cf. maharen (“ram”) from maharaen. Doublet of halen (“table salt”).",
  "forms": [
    {
      "form": "halwynau",
      "tags": [
        "plural"
      ]
    }
  ],
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      "args": {
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      "expansion": "halwyn m (plural halwynau, not mutable)",
      "name": "cy-noun"
    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
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          "name": "Pages with 1 entry",
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          "langcode": "cy",
          "name": "Chemistry",
          "orig": "cy:Chemistry",
          "parents": [
            "Sciences",
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            "Fundamental"
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      ],
      "glosses": [
        "salt"
      ],
      "id": "en-halwyn-cy-noun-Y0ea1poJ",
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          "chemistry",
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          "salt",
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      "raw_glosses": [
        "(chemistry) salt"
      ],
      "synonyms": [
        {
          "word": "hâl"
        }
      ],
      "tags": [
        "masculine",
        "not-mutable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "halwyn"
}

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      "expansion": "Inherited",
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    {
      "args": {
        "1": "cy",
        "2": "wlm",
        "3": "halaen",
        "4": "",
        "5": "",
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        "g2": "",
        "g3": "",
        "id": "",
        "lit": "",
        "nocat": "",
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        "sort": "",
        "tr": "",
        "ts": ""
      },
      "expansion": "Middle Welsh halaen",
      "name": "inh"
    },
    {
      "args": {
        "1": "cy",
        "2": "wlm",
        "3": "halaen"
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    },
    {
      "args": {
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        "2": "halen (“table salt”)"
      },
      "expansion": "Doublet of halen (“table salt”)",
      "name": "doublet"
    }
  ],
  "etymology_text": "Inherited from Middle Welsh halaen, cf. maharen (“ram”) from maharaen. Doublet of halen (“table salt”).",
  "forms": [
    {
      "form": "halwynau",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
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        "2": "au"
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    }
  ],
  "lang": "Welsh",
  "lang_code": "cy",
  "pos": "noun",
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        "Pages with entries",
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        "Welsh nouns",
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        "Welsh terms derived from Middle Welsh",
        "Welsh terms inherited from Middle Welsh",
        "cy:Chemistry"
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      "glosses": [
        "salt"
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      "links": [
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          "chemistry",
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          "salt",
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      ],
      "raw_glosses": [
        "(chemistry) salt"
      ],
      "synonyms": [
        {
          "word": "hâl"
        }
      ],
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        "masculine",
        "not-mutable"
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        "chemistry",
        "natural-sciences",
        "physical-sciences"
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  "word": "halwyn"
}