"plwm" meaning in Gallois

{
  "categories": [
    {
      "kind": "other",
      "name": "Mots en gallois issus d’un mot en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Noms communs en gallois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Gallois",
      "orig": "gallois",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "Du latin plumbum → voir plom en breton."
  ],
  "forms": [
    {
      "form": "blwm",
      "raw_tags": [
        "Lénition"
      ],
      "tags": [
        "singular"
      ]
    },
    {
      "form": "mhlwm",
      "raw_tags": [
        "Nasalisation"
      ],
      "tags": [
        "singular"
      ]
    },
    {
      "form": "phlwm",
      "raw_tags": [
        "Spirantisation"
      ],
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Gallois",
  "lang_code": "cy",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Éléments chimiques en gallois",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Plomb."
      ],
      "id": "fr-plwm-cy-noun-P4dLSaSP",
      "topics": [
        "chemistry"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\plʊm\\"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "plwm"
}

{
  "categories": [
    "Mots en gallois issus d’un mot en latin",
    "Noms communs en gallois",
    "gallois"
  ],
  "etymology_texts": [
    "Du latin plumbum → voir plom en breton."
  ],
  "forms": [
    {
      "form": "blwm",
      "raw_tags": [
        "Lénition"
      ],
      "tags": [
        "singular"
      ]
    },
    {
      "form": "mhlwm",
      "raw_tags": [
        "Nasalisation"
      ],
      "tags": [
        "singular"
      ]
    },
    {
      "form": "phlwm",
      "raw_tags": [
        "Spirantisation"
      ],
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Gallois",
  "lang_code": "cy",
  "pos": "noun",
  "pos_title": "Nom commun",
  "senses": [
    {
      "categories": [
        "Éléments chimiques en gallois"
      ],
      "glosses": [
        "Plomb."
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\plʊm\\"
    }
  ],
  "tags": [
    "masculine"
  ],
  "word": "plwm"
}