windchill

This term describes a physiological sensation rather than a change in the actual ambient air temperature. It is primarily used in meteorological reports and weather forecasts to warn the public about the increased risk of frostbite and hypothermia when wind speeds are high.

In technical and casual usage, it is frequently paired with the word "factor" to form the compound "windchill factor," though "windchill" alone is sufficient to convey the meaning. It is distinct from "wind chill" (two words), which is often used as a descriptive phrase, whereas the single-word form functions as a specific noun for the calculated value.