Heat Index Definition
    noun
  
 A number expressed in degrees Fahrenheit, computed from the temperature and the relative humidity, and used as an indication of the apparent temperature as it would be felt by a person outdoors (Ex.: a temperature of 90°F and a relative humidity of 50% yield a heat index of 96°F)
 Webster's New World 
Other Word Forms of Heat Index
Noun
Singular:
 heat indexPlural:
 heat-indices, heat indexesFind Similar Words
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