"phosgene" meaning in English

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  "etymology_text": "From Ancient Greek φῶς (phôs, “light”) + -gene, due to its first synthesis involving sunlight.",
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      "form": "phosgenes",
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      "derived": [
        {
          "word": "phosgene oxime"
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          "ref": "2006, Thomas Pynchon, Against the Day, Vintage, published 2007, page 265:",
          "text": "“‘Poison gas’?” A new one on Lew. But Dr. De Bottle had taken on a somber look. “Phosgene.”",
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        "carbonyl chloride"
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          "carbonyl chloride",
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        "(inorganic chemistry) carbonyl chloride"
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      "form": "phosgenes",
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