"sydnone" meaning in English

{
  "forms": [
    {
      "form": "sydnones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sydnone (plural sydnones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Organic chemistry",
          "orig": "en:Organic chemistry",
          "parents": [
            "Chemistry",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "sydnonimine"
        }
      ],
      "glosses": [
        "Any of a class of 1,2,3-oxadiazoles having an oxygen atom attached to the 5 position; they are mesoionic"
      ],
      "id": "en-sydnone-en-noun-jehLE8bO",
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "oxadiazole",
          "oxadiazole"
        ],
        [
          "oxygen",
          "oxygen"
        ],
        [
          "mesoionic",
          "mesoionic"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any of a class of 1,2,3-oxadiazoles having an oxygen atom attached to the 5 position; they are mesoionic"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "sydnone"
}

{
  "derived": [
    {
      "word": "sydnonimine"
    }
  ],
  "forms": [
    {
      "form": "sydnones",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sydnone (plural sydnones)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "en:Organic chemistry"
      ],
      "glosses": [
        "Any of a class of 1,2,3-oxadiazoles having an oxygen atom attached to the 5 position; they are mesoionic"
      ],
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "oxadiazole",
          "oxadiazole"
        ],
        [
          "oxygen",
          "oxygen"
        ],
        [
          "mesoionic",
          "mesoionic"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any of a class of 1,2,3-oxadiazoles having an oxygen atom attached to the 5 position; they are mesoionic"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "sydnone"
}