heat wave

Noun

 * 1)  A period of exceptionally hot weather.
 * 2)  Three consecutive days with daytime high temperature of 90 degrees Fahrenheit or higher.
 * 3) An electromagnetic wave in the infrared spectrum.
 * 1)  Three consecutive days with daytime high temperature of 90 degrees Fahrenheit or higher.
 * 2) An electromagnetic wave in the infrared spectrum.