heat wave

noun
1.
an air mass of high temperature covering an extended area and moving relatively slowly.
2.
a period of abnormally hot and usually humid weather.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
heat wave
 
n
1.  a continuous spell of abnormally hot weather
2.  (not in technical use) an extensive slow-moving air mass at a relatively high temperature

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Heat wave is always a great word to know.
So is ort. Does it mean:
a scrap or morsel of food left at a meal.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Example sentences
It is important to know the terms used to describe heat wave conditions.
You've been caught in a rolling blackout that state regulators have ordered as
  a heat wave brings on millions of air conditioners.
When their predictions turn from cold snap to heat wave, say, it can play havoc
  with the forward price of gas.
If the former, then it is probably reasonable to link the heat wave with global
  warming.
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