[tem-per-uh-cher-hyoo-mid-i-tee or, often, -yoo-, -pruh-, -per-cher-, -choo
r] 
| a number representing an estimate of the effect of temperature and moisture on humans, computed by multiplying the sum of dry-bulb and wet-bulb temperature readings by 0.4 and adding 15, with 65 assumed as the highest comfortable index. Abbreviation: T.H.I. |