"caput mortuum" meaning in English

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  "etymology_text": "Unadapted borrowing from Latin caput mortuum (literally “dead head”).",
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  "lang_code": "en",
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        "Worthless residue of sublimation or distillation."
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        "(alchemy) Worthless residue of sublimation or distillation."
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        {
          "ref": "2018, Kate Atkinson, Transcription, page 227",
          "text": "Were they working their way through the colours and now had reached the more abstruse layers of the spectrum? What would be next — caput mortuum, heliotrope? The colours of the day.",
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      "glosses": [
        "Cardinal purple, a variety of haematite iron oxide pigment."
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      "ipa": "/ˈkæpət ˈmɔː(ɹ)tjʊəm/"
    }
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  "word": "caput mortuum"
}

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  "lang_code": "en",
  "pos": "noun",
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