English

Definition of altitude sickness noun from the Oxford Advanced Learner's Dictionary

 

altitude sickness

 noun
noun
BrE BrE//ˈæltɪtjuːd sɪknəs//
 
; NAmE NAmE//ˈæltɪtuːd sɪknəs//
 
[uncountable]
 
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illness caused by a lack of oxygen, because of being very high above sea level, for example on a mountain
See the Oxford Advanced American Dictionary entry: altitude sickness