"-s-" meaning in Limbourgeois

{
  "categories": [
    {
      "kind": "other",
      "name": "Interfixes en limbourgeois",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Limbourgeois",
      "orig": "limbourgeois",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Limbourgeois",
  "lang_code": "li",
  "pos": "interfix",
  "pos_title": "Interfixe",
  "senses": [
    {
      "glosses": [
        "Interfixe de liaison entre deux racines, indiquant que la racine précédente devient attribut de la racine suivante."
      ],
      "id": "fr--s--li-interfix-gZMd9w2v"
    }
  ],
  "sounds": [
    {
      "ipa": "\\s\\"
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "-s-"
}

{
  "categories": [
    "Interfixes en limbourgeois",
    "limbourgeois"
  ],
  "lang": "Limbourgeois",
  "lang_code": "li",
  "pos": "interfix",
  "pos_title": "Interfixe",
  "senses": [
    {
      "glosses": [
        "Interfixe de liaison entre deux racines, indiquant que la racine précédente devient attribut de la racine suivante."
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\s\\"
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "-s-"
}