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Oxo
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oxygenless climbing
ox·y·gen·less climb·ing [ òksijənləss klming ]


noun 
Definition:
 
climbing without carrying oxygen supplies: climbing, especially at heights above 8 km (5 mi), without using oxygen in containers
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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