noun
: a period of relatively high temperatures ; specifically : one caused by the southerly winds in front of an advancing cyclone or by the accumulating heat in a stagnant anticyclone — called also heat wave
noun
: a period of relatively high temperatures ; specifically : one caused by the southerly winds in front of an advancing cyclone or by the accumulating heat in a stagnant anticyclone — called also heat wave
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012