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 index
Plural:
heat-indices, heat indexes
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