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

Example sentences from the Web for heat wave

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