"metacetyl" meaning in English

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      "expansion": "metacetyl (plural not attested)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Organic chemistry",
          "orig": "en:Organic chemistry",
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            "Fundamental"
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      ],
      "glosses": [
        "propionyl"
      ],
      "id": "en-metacetyl-en-noun-mrcuUyUp",
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        [
          "organic chemistry",
          "organic chemistry"
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        [
          "propionyl",
          "propionyl"
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        "(obsolete, organic chemistry) propionyl"
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      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
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  "word": "metacetyl"
}

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      "expansion": "metacetyl (plural not attested)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English nouns with unattested plurals",
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        "en:Organic chemistry"
      ],
      "glosses": [
        "propionyl"
      ],
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "propionyl",
          "propionyl"
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      "raw_glosses": [
        "(obsolete, organic chemistry) propionyl"
      ],
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        "no-plural",
        "obsolete"
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      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
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  ],
  "word": "metacetyl"
}