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optometry
optophone
opulent
opuntia
opus
opus anglicanum
opuscule
-or (1)
-or (2)
OR (1)
OR (2)
or (1)
or (2)
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oral hygiene
o·ral hy·giene


noun 
Definition:
 
dentistry 
Same as  dental hygiene

o·ral hy·gien·ist noun
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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