Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A measurement of the air temperature that factors in the effect of relative humidity, used as an indicator of the perceived temperature.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun US, meteorology A figure used by American meteorologists to describe the apparent heat felt by a person as the result of a combination of temperature and humidity.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From heat + index

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