"esprit de sel" meaning in Français

{
  "categories": [
    {
      "kind": "other",
      "name": "Dates manquantes en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Locutions nominales en français",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Traductions en anglais",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Traductions en espagnol",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Français",
      "orig": "français",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_texts": [
    "(Siècle à préciser) De esprit et sel."
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "related": [
    {
      "word": "esprit-de-sel"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Lexique en français de la chimie",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Termes désuets en français",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Acide chlorhydrique."
      ],
      "id": "fr-esprit_de_sel-fr-noun--UUVGjLX",
      "tags": [
        "obsolete"
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "translations": [
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "spirit of salt"
    },
    {
      "lang": "Espagnol",
      "lang_code": "es",
      "tags": [
        "masculine"
      ],
      "word": "espíritu de sal"
    }
  ],
  "word": "esprit de sel"
}

{
  "categories": [
    "Dates manquantes en français",
    "Locutions nominales en français",
    "Traductions en anglais",
    "Traductions en espagnol",
    "français"
  ],
  "etymology_texts": [
    "(Siècle à préciser) De esprit et sel."
  ],
  "lang": "Français",
  "lang_code": "fr",
  "pos": "noun",
  "pos_title": "Locution nominale",
  "related": [
    {
      "word": "esprit-de-sel"
    }
  ],
  "senses": [
    {
      "categories": [
        "Lexique en français de la chimie",
        "Termes désuets en français"
      ],
      "glosses": [
        "Acide chlorhydrique."
      ],
      "tags": [
        "obsolete"
      ],
      "topics": [
        "chemistry"
      ]
    }
  ],
  "tags": [
    "masculine"
  ],
  "translations": [
    {
      "lang": "Anglais",
      "lang_code": "en",
      "word": "spirit of salt"
    },
    {
      "lang": "Espagnol",
      "lang_code": "es",
      "tags": [
        "masculine"
      ],
      "word": "espíritu de sal"
    }
  ],
  "word": "esprit de sel"
}