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o/c
O Canada
o’clock
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O/D
o.d. (1)
o.d. (2)
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O level
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O2 sup
O2 sup [ ō t sùp ]


noun 
Definition:
 
oxygen carried on steep climbs: tanks of oxygen carried on climbs above 8 km (5 mi) high ( informal )

[O2 from the chemical symbol for oxygen, sup shortening of supplement]
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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