"protosulfures" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Formes de noms communs en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "forms": [
    {
      "form": "protosulfure",
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Exemples en français",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              23,
              36
            ]
          ],
          "ref": "René Cerbelaud, H. Le Bars, Nouveau manuel vétérinaire, 1953",
          "text": "Il se combine avec des protosulfures métalliques, pour donner des sulfocarbonates."
        }
      ],
      "form_of": [
        {
          "word": "protosulfure"
        }
      ],
      "glosses": [
        "Pluriel de protosulfure."
      ],
      "id": "fr-protosulfures-fr-noun-C9XaVg6Q"
    }
  ],
  "sounds": [
    {
      "ipa": "\\pʁɔ.tɔ.syl.fyʁ\\"
    }
  ],
  "tags": [
    "form-of",
    "masculine"
  ],
  "word": "protosulfures"
}

{
  "categories": [
    "Formes de noms communs en français",
    "français"
  ],
  "forms": [
    {
      "form": "protosulfure",
      "tags": [
        "singular"
      ]
    }
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Forme de nom commun",
  "senses": [
    {
      "categories": [
        "Exemples en français"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              23,
              36
            ]
          ],
          "ref": "René Cerbelaud, H. Le Bars, Nouveau manuel vétérinaire, 1953",
          "text": "Il se combine avec des protosulfures métalliques, pour donner des sulfocarbonates."
        }
      ],
      "form_of": [
        {
          "word": "protosulfure"
        }
      ],
      "glosses": [
        "Pluriel de protosulfure."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\pʁɔ.tɔ.syl.fyʁ\\"
    }
  ],
  "tags": [
    "form-of",
    "masculine"
  ],
  "word": "protosulfures"
}