heat wave

or heat·wave

[ heet-weyv ]
/ ˈhitˌweɪv /

noun

an air mass of high temperature covering an extended area and moving relatively slowly.
a period of abnormally hot and usually humid weather.

Origin of heat wave

First recorded in 1875–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for heat wave

heat wave


noun

a continuous spell of abnormally hot weather
(not in technical use) an extensive slow-moving air mass at a relatively high temperature
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012