a number representing the effect of temperature and humidity on humans by combining the two variables into an "apparent" temperature, introduced as a replacement for the temperature-humidity index: a temperature of 90° and relative humidity of 65 percent combine to produce a heat index of 102. Abbr.: H.I.
HEAT INDEX
Meaning of HEAT INDEX in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012