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polar vortex

[poh-ler vawr-teks] /ˈpoʊ lər ˈvɔr tɛks/
noun
1.
a whirling mass of very cold air that sits over the North or South Pole:
A displaced polar vortex is causing Arctic temperatures across the United States.
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Based on the Random House Dictionary, © Random House, Inc. 2016.
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