"thunderhead" meaning in English

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  "etymology_text": "From thunder + head.",
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          "ref": "1918, Willa Cather, chapter 19, in My Ántonia, Boston: Houghton Mifflin, page 158:",
          "text": "Half the sky was checkered with black thunderheads, but all the west was luminous and clear:",
          "type": "quote"
        },
        {
          "ref": "1947, Kenneth Roberts, chapter 28, in Lydia Bailey, Garden City, NY: Doubleday:",
          "text": "The wisps of smoke above Léogane became dark and thick, and flowered into a towering thunderhead—an ominous cloud that drifted slowly to the westward and was constantly replenished at its base by uprushes of blacker smoke.",
          "type": "quote"
        },
        {
          "ref": "2000, Philip Pullman, chapter 29, in The Amber Spyglass, New York: Del Rey, page 349:",
          "text": "The sky ahead was huge with storm: all the whiteness had gone from the thunderheads, and they rolled and swirled with sulphur yellow, sea green, smoke gray, oil black, a queasy churning miles high and as wide as the horizon.",
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        "The top portion of a cumulonimbus cloud, which tends to be flattened or fibery in appearance, and may be indicative of thunderstorm activity."
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          "cumulonimbus",
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          "cloud",
          "cloud"
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          "thunderstorm",
          "thunderstorm"
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        "Cumulonimbus cloud"
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  "etymology_text": "From thunder + head.",
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          "ref": "1918, Willa Cather, chapter 19, in My Ántonia, Boston: Houghton Mifflin, page 158:",
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          "type": "quote"
        },
        {
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          "type": "quote"
        },
        {
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