Definition of hypothermia noun from the Oxford Advanced Learner's Dictionary

 

hypothermia

 noun
noun
BrE BrE//ˌhaɪpəˈθɜːm//
 
; NAmE NAmE//ˌhaɪpəˈθɜːrm//
 
[uncountable]
 
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a medical condition in which the body temperature is much lower than normal Elderly people may die of hypothermia if they cannot afford to heat their homes. Word Origin late 19th cent.: from hypo- ‘below’ + Greek thermē ‘heat’.
See the Oxford Advanced American Dictionary entry: hypothermia