acute mountain sickness
noun
: altitude sickness that is experienced usually within several hours to one day of ascending above 8000 to 10,000 feet (about 2500 to 3000 meters) and that is marked by headache, nausea, loss of appetite, vomiting, insomnia, dizziness, and fatigue, and may lead to serious complications including severe edema of the brain or lungs
—abbreviation AMS
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Merriam-Webster unabridged
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