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What do a.m. and p.m. stand for?

thi-

1.
variant of thio- before a vowel:
thiazine.

T.H.I.

1.
temperature-humidity index.

temperature-humidity index

[tem-per-uh-cher-hyoo-mid-i-tee or, often, -yoo-, -pruh-, -per-cher-, -choo r] /ˈtɛm pər ə tʃər hyuˈmɪd ɪ ti or, often, -yu-, -prə-, -pər tʃər-, -ˌtʃʊər/
noun
1.
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.
Compare heat index.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for thi

THI

abbreviation
1.
temperature-humidity index

temperature-humidity index

noun
1.
an index of the effect on human comfort of temperature and humidity levels, 65 being the highest comfortable level

thi-

combining form
1.
a variant of thio-
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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thi in Medicine

thi- pref.
Variant of thio-.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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