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from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An onset of unusually cold weather within a 24-hour period.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A short period of very cold weather; a cold snap
  • n. A permanent wave in the hair set by special solutions without the aid of any heating machine.

from the GNU version of the Collaborative International Dictionary of English

  • In the terminology of the United States Weather Bureau, an unusual fall in temperature, to or below the freezing point, exceeding 16┬░ in twenty-four hours or 20┬░ in thirty-six hours, independent of the diurnal range.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a wave of unusually cold weather


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