"acetonylidene" meaning in English

{
  "forms": [
    {
      "form": "acetonylidenes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
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      "expansion": "acetonylidene (countable and uncountable, plural acetonylidenes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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          "source": "w"
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          "source": "w"
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          "langcode": "en",
          "name": "Organic chemistry",
          "orig": "en:Organic chemistry",
          "parents": [
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            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "The divalent radical CH₃-CO-CH= formally derived from acetone"
      ],
      "id": "en-acetonylidene-en-noun-WzYQp7Hi",
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "radical",
          "radical"
        ],
        [
          "acetone",
          "acetone"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) The divalent radical CH₃-CO-CH= formally derived from acetone"
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "acetonylidene"
}

{
  "forms": [
    {
      "form": "acetonylidenes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "acetonylidene (countable and uncountable, plural acetonylidenes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "en:Organic chemistry"
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      "glosses": [
        "The divalent radical CH₃-CO-CH= formally derived from acetone"
      ],
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "radical",
          "radical"
        ],
        [
          "acetone",
          "acetone"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) The divalent radical CH₃-CO-CH= formally derived from acetone"
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "acetonylidene"
}