mountain sickness en · NOUN
Meanings
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(uncountable) Altitude sickness.
Mountain-sickness, with its nausea, first comes to those who are bilious, or to those who are hurrying or exerting themselves more than usual.
1915 April 14, Enos A. Mills, “Going to the Top”, in The Rocky Mountain Wonderland, Houghton Mifflin, →LCCN, →OCLC, page 10: