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An onset of unusually cold weather within a 24-hour period.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
1. (Physical Geography) meteorol a sudden spell of low temperatures over a wide area, often following the passage of a cold front
2. (Hairdressing & Grooming) hairdressing a permanent wave made by chemical agents applied at normal temperatures
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
1. a rapid and considerable drop in temperature, usu. affecting a large area.
2. a permanent wave set in the hair by chemical solutions without the aid of heat.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.