sorochen.

1878 I. L. Bird in Leisure Hour 16 Feb. 111/2 I feel a singular lassitude..but this is said to be the milder form of the affection known on higher altitudes as soroche, or ‘mountain sickness’.

1891 E. B. Clark Twelve Months Peru 104 A headache with a weighty feeling on the brow, vomiting, and breathlessness are the usual symptoms of sorroche.

1895 S. I. Bailey in Ann. Astr. Obs. Harvard 34 12 One of the party..suffered quite severely from soroche or mountain-sickness.

1922 Glasgow Herald 4 Jan. 4 In order to minimise the effects of soroche, or mountain sickness, on persons suffering from weak heart the company provides cars with compartments equipped with oxygen.

1925 Contemp. Rev. Jan. 95 The air is so rarified that the newcomer finds a difficulty in breathing, even if he escapes an attack of soroche (mountain sickness).

1927 W. G. Kendrew Climates of Continents 322 The ‘soroche’, as the complaint is called locally, causes breathlessness and palpitation, loss of appetite, and sometimes nose-bleeding.

1963 Times 7 June 13/6 Faced with another presidential election this Sunday, the Peruvian people have apparently succumbed to some political equivalent of the soroche, the mountain sickness that shortens the breath, softens the will, and enfeebles the body.

1970 Sci. Amer. Feb. 56/1 Even mountain natives sometimes lose their acclimatization to high altitude and incur soroche (chronic mountain sickness), which is characterized by extreme elevation of the relative number and mass of red cells in the blood..and ultimately congestive heart failure if the victim remains at high altitude.

1981 L. Leamer Assignment ix. 129 It's great to breathe some real air again... No more soroche.