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oxidizing agent
oxidoreductase
oxime
oximeter
oxlip
Oxo
Oxon.
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oxonium
oxonium ion
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oxygen mask
ox·y·gen mask (plural ox·y·gen masks)


noun 
Definition:
 
device providing oxygen for breathing: a device fitting closely over the nose and mouth through which oxygen is supplied to assist breathing, e.g. at high altitudes
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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