noun
a volcano capable of producing an eruption with major effects on the global climate and ecosystem
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The eruption of a supervolcano can have catastrophic effects on the surrounding area.
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Have you heard about that supervolcano that's overdue for an eruption?
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Dude, if that supervolcano blows, we're all toast.
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Her anger was like a dormant supervolcano, ready to erupt at any moment.