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orthovoltage therapy
ortolan
ORV
Orvieto
-ory
oryx
orzo
OS
Os
os (1)
os (2)
OSA
Osage (1)
Osage (2)
Osage orange
Osaka
Oscan
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Os
Os


symbol 
Definition:
 
chemical elements osmium
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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