"potassium nitrite" meaning in English

{
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    {
      "form": "potassium nitrites",
      "tags": [
        "plural"
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      "expansion": "potassium nitrite (plural potassium nitrites)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      ],
      "glosses": [
        "The potassium salt of nitrous acid, KNO₂."
      ],
      "id": "en-potassium_nitrite-en-noun-7As1kMZo",
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "salt",
          "salt"
        ],
        [
          "nitrous acid",
          "nitrous acid"
        ]
      ],
      "raw_glosses": [
        "(chemistry) The potassium salt of nitrous acid, KNO₂."
      ],
      "synonyms": [
        {
          "word": "E249 when used as a preservative"
        }
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "potassium nitrite"
      ]
    }
  ],
  "word": "potassium nitrite"
}

{
  "forms": [
    {
      "form": "potassium nitrites",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
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      "expansion": "potassium nitrite (plural potassium nitrites)",
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "The potassium salt of nitrous acid, KNO₂."
      ],
      "links": [
        [
          "chemistry",
          "chemistry"
        ],
        [
          "salt",
          "salt"
        ],
        [
          "nitrous acid",
          "nitrous acid"
        ]
      ],
      "raw_glosses": [
        "(chemistry) The potassium salt of nitrous acid, KNO₂."
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "physical-sciences"
      ],
      "wikipedia": [
        "potassium nitrite"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "E249 when used as a preservative"
    }
  ],
  "word": "potassium nitrite"
}