WordReference Random House Unabridged Dictionary of American English © 2025
altitude sick′ness, [Pathol.]
  1. Pathologya condition affecting some persons at high altitudes, caused by insufficient oxygen in the blood and characterized by dizziness, nausea, and shortness of breath.
  • 1915–20

Collins Concise English Dictionary © HarperCollins Publishers::
altitude sickness
  1. another name for mountain sickness
'altitude sickness' also found in these entries (note: many are not synonyms or translations):

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