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althorn
although
alti-
altimeter
Altiplano
altiplano
altissimo
altitude
altitude sickness
alto
alto-
alto clef
alto-relievo
altocumulus
altogether
altoist
Alton
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altitude sickness
al·ti·tude sick·ness


noun 
Definition:
 
effect of low oxygen levels: a condition caused by low levels of oxygen in the air at high altitudes, resulting in nausea and breathlessness
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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