Pathology. subnormal body temperature.
Medicine/Medical. the artificial reduction of body temperature to slow metabolic processes, as for facilitating heart surgery.

1885–90; hypo- + therm- + -ia

hypothermic, adjective
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World English Dictionary
hypothermia (ˌhaɪpəʊˈθɜːmɪə)
1.  pathol an abnormally low body temperature, as induced in the elderly by exposure to cold weather
2.  med the intentional reduction of normal body temperature, as by ice packs, to reduce the patient's metabolic rate: performed esp in heart and brain surgery

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1886, Mod.L., from hypo- "under" (see hypo-) + Gk. therme "heat."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hypothermia hy·po·ther·mi·a (hī'pə-thûr'mē-ə)
Abnormally low body temperature.

hy'po·ther'mic (-mĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hypothermia   (hī'pə-thûr'mē-ə)  Pronunciation Key 
An abnormally low body temperature, often caused by prolonged exposure to cold. Compare hyperthermia.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Adults may be able to work with it, but cubs are not equipped for prolonged immersion in cold water and can become hypothermic.
Infants, people in poor health, and the elderly can easily become hypothermic.
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